CN102651635B

CN102651635B - Fully differential power current amplifier

Info

Publication number: CN102651635B
Application number: CN201210151585.8A
Authority: CN
Inventors: 李效龙; 张冰
Original assignee: Jiangsu University of Science and Technology
Current assignee: Jiangsu University of Science and Technology
Priority date: 2012-05-15
Filing date: 2012-05-15
Publication date: 2014-11-05
Anticipated expiration: 2032-05-15
Also published as: CN102651635A

Abstract

The invention discloses a fully differential power current amplifier, which consists of an active amplification network and a feedback network, wherein the active amplification network consists of two identical standard active two-port amplification networks, and the feedback network consists of a current parallel negative feedback network realized by two respective free transformers and a current series negative feedback network realized by two single passive devices. The standard active two-port amplification networks and the transformers form one group in a pairwise way, the dotted end of a primary coil of each transformer is connected with the reverse-phase output end of the standard active two-port amplification networks, the unlike end of the primary coil is connected with a load, the dotted end of a secondary coil of each transformer is connected with the same-phase input end of the standard active two-port amplification networks, and the unlike end of the secondary coil is grounded. Two ends of the passive devices are respectively and simultaneously connected with the same-phase output end and the reverse-phase input end of one standard active two-port amplification network in the two standard active two-port amplification networks. The fully differential power current amplifier has the advantages that the integration degree is high, the cost is low, and the performance is good.

Description

A kind of fully differential power current amplifier

Technical field

The invention belongs to analog integrated circuit technical field, specifically relate to a kind of fully differential power current amplifier.

Background technology

Impedance matching is the design difficulty of wide-band amplifier.The circuit structure of common broadband (or ultra broadband) amplifier, as common gate (or common base) amplifier, distributed amplifier and resistive voltage parallel negative feedback amplifier etc., between the important parameters such as its impedance matching and noise, the linearity and power consumption or chip area, be relevant, the realization that is its impedance matching is to worsen noise, or the reduction linearity, or increase power consumption or chip area etc. and exchange for for cost.Secondly, these do not have input impedance and the transfer function of explication in broadband at amplifier, and therefore in its band, gain is uneven.The 3rd, the output signal of these amplifiers is power signal, and therefore the output of amplifier also needs impedance matching network.The 4th, input signal and the output signal of these amplifiers are single-ended signal, and therefore the ability of its anti-jamming signal, is not suitable for remote transmission signal.

A kind of fully differential power current amplifier of the present invention, there is no relevant Introduction of Literatures at present, does not also search relevant patent document.

Summary of the invention

Object of the present invention and the technical problem that will solve are the defects existing for prior art, propose a kind of fully differential power current amplifier.

For achieving the above object, the technical solution used in the present invention is:

A kind of fully differential power current amplifier, is made up of active amplification network and feedback network; Described active amplification network amplifies networks 1 and active two ports of the second standard by active two ports of two the first identical standards and amplifies networks 1 and form, and described feedback network is made up of two the first identical transformers 2 and the second transformer 2 and passive device 3; Active two ports of the first wherein said standard amplify network 1 and are connected with the active two ports amplification in-phase input ends of network 1 of the second standard and the power signal of input difference; The Same Name of Ends of the first described transformer 2 primary coils is connected with the inverse output terminal that active two ports of the first described standard amplify network 1, and its different name end is connected with one end of load; The Same Name of Ends of the first described transformer 2 secondary coils is connected with the in-phase input end that active two ports of the first described standard amplify network 1, its different name end ground connection; The Same Name of Ends of the second described transformer 2 primary coils is connected with the inverse output terminal that active two ports of the second described standard amplify network 1, and its different name end is connected with the other end of load; The Same Name of Ends of the second described transformer 2 secondary coils is connected with the in-phase input end that active two ports of the second described standard amplify network 1, its different name end ground connection; One end of described passive device 3 connects inverting input and the in-phase output end of the active two ports amplification networks 1 of the first described standard simultaneously, and its other end connects inverting input and the in-phase output end of the active two ports amplification networks 1 of the second described standard simultaneously; The differential current signal that active two ports of first, second described standard amplify the reversed-phase output output of networks 1 is flowed through respectively after the primary coil of first, second transformer 2 and is exported load to.

The output signal that active two ports of first, second above-mentioned standard amplify network 1 is current signal.

First, second above-mentioned transformer 2 forms the negative feedback network that two configurations are current parallel, and passive device 3 forms the negative feedback network that two configurations are current-series.

First, second above-mentioned transformer 2 has high turn ratio and high magnetic coefficient simultaneously.

Above-mentioned passive device 3 can be any in resistance, inductance or microstrip line.

A kind of fully differential power current-amplifying appliance of the present invention has the following advantages and beneficial effect:

1, because the design of impedance matching, noise and distortion in a kind of fully differential power current amplifier of the present invention is orthogonal, therefore it can realize impedance matching, low noise and high linearity in broadband simultaneously;

Input impedance and the transfer function 2, in broadband due to a kind of fully differential power current amplifier of the present invention with explication, therefore it can realize good impedance matching in broadband, and flat gain in band;

3, because the output signal of a kind of differential power current amplifier of the present invention is current signal, therefore its output does not need impedance matching network;

4, because the input/output signal of a kind of fully differential power current amplifier of the present invention is differential signal, therefore high, the long transmission distance of its common-mode rejection ratio.

Brief description of the drawings

Fig. 1 is principle schematic of the present invention;

Fig. 2 is the concrete implementing circuit figure of Fig. 1;

In figure: 1. active two ports of standard amplify network, 2. transformer, 3. passive device.

Embodiment

In order to deepen the understanding of the present invention, below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, and this embodiment only, for explaining the present invention, does not form the regulation to protection range of the present invention.

Figure 2 shows that a kind of concrete implementing circuit figure based on CMOS technique of Fig. 1.As depicted in figs. 1 and 2, a kind of fully differential power current amplifier, is made up of active amplification network and feedback network; Wherein, described active amplification network amplifies networks 1 by active two ports of two identical standards and forms, and the negative feedback network that the negative feedback network that described feedback network is current parallel by two configurations and two configurations are current-series forms.Two described current parallel negative feedback networks are realized by two identical transformers 2 respectively.Two described current-series negative feedback networks are realized by single passive device 3.In Fig. 2, the dual-stage amplifier that the active two ports amplification networks 1 of the first described standard are made up of transistor VF1, VF3 and VF4 is realized, and wherein its input stage is made up of commonsource amplifier VF1, and its output stage is made up of fully-differential amplifier VF3 and VF4; The active two ports amplification networks 1 of the second described standard are that form by transistor VF2, VF5 and VF6 to be realized with the dual-stage amplifier of active two ports amplification network 1 symmetries of described the first standard, wherein its input stage is made up of commonsource amplifier VF2, and its output stage is made up of fully-differential amplifier VF5 and VF6.Transistor VF7～VF16 provides bias current for transistor VF1～VF6.The integrated transformer that two described transformers 2 are 1:N by turn ratio is realized, and indicates respectively with TF1 and TF2.The resistance that described single passive device 3 is R/2 by two resistances is in series.For example, be 2.5 Ω if get R, the effective turn of transformer TF1 and TF2 is 20 than N.Power signal (the u of difference _in+, u _in-and i _in+, i _in-) input to the grid of VF1 and VF2.The single-ended signal of being exported by the drain electrode of VF1 couples directly to the grid of VF3 and VF5 simultaneously, and the signal of being exported by the drain electrode of VF2 couples directly to the grid of VF4 and VF6 simultaneously.The current signal of being exported by the drain electrode of VF3 and VF6 is coupled to respectively the source electrode of VF1 and VF2 separately by capacitor C 1 and C2, the source electrode of VF1 and VF2 is connected with one end of two resistance R/2 separately.The current signal of being exported by the drain electrode of VF4 and VF5 is connected with the Same Name of Ends of transformer TF2 primary coil with transformer TF1 respectively, and its different name end is connected to load (Z through coupling capacitance C3 and C4 respectively _l) two ends.The differential current signal of being exported by the drain electrode of VF4 and VF5 flows through after the primary coil and coupling capacitance C3 and C4 of transformer TF1 and transformer TF2, the output current signal (i of difference _o-, i _o+) inflow load Z _l.The Same Name of Ends of transformer TF1 and transformer TF2 secondary coil is connected with the grid of VF1 and VF2 respectively separately, and its different name end is all connected to one and provides the voltage source U of direct current biasing for grid _gG.VF13, VF14 and resistance R in Fig. 2 ' formation combination current source.Be source electrode and the power supply U of VF13 _dDbe connected, its drain and gate all with resistance R ' one end be connected, and the source ground of VF14, its drain and gate all with resistance R ' the other end be connected.VF7～VF12 is the mirror current source of VF13, and VF15 and VF16 are the mirror current source of VF14.The grid that is VF7～VF12 is all connected with drain electrode with the grid of VF13, its source electrode all with power supply U _dDbe connected.The grid of VF15 and VF16 is all connected with drain electrode with the grid of VF14, and its source electrode is all connected to ground.The drain electrode of VF7 is connected with the drain electrode of VF1, the drain electrode of VF12 is connected with the drain electrode of VF2, the drain electrode of VF8 is connected with the drain electrode of VF3, the drain electrode of VF9 is connected with the different name end of transformer TF1 primary coil, the drain electrode of VF10 is connected with the different name end of the primary coil of transformer TF2, and the drain electrode of VF11 is connected with the drain electrode of VF6.The source electrode of VF3～VF6 is all connected to the drain electrode of VF16, and two connected ends in resistance R/2 are connected to the drain electrode of VF15.In above-mentioned transistor, VF1～VF6 and VF14～VF16 are N-channel mosfet, and VF7～VF13 is P-channel mosfet.Wherein VF7 and VF12's is measure-alike, and VF8～VF11's is measure-alike, and VF1 and VF2's is measure-alike, and VF3～VF6's is measure-alike.

The present embodiment is manufactured based on CMOS technique, and all devices all can be integrated in same chip, and therefore integrated level is high, and cost is low, and performance is good.

Claims

1. a fully differential power current amplifier, is made up of active amplification network and feedback network; Described active amplification network amplifies network (1) by active two ports of the first standard and the active two ports amplification networks (1) of the second standard form, it is characterized in that, described feedback network is made up of the first transformer (2), the second transformer (2) and passive device (3); Active two ports of the first wherein said standard amplify network (1) and are connected with the power signal of input difference with the in-phase input end that active two ports of the second standard amplify network (1); The Same Name of Ends of described the first transformer (2) primary coil is connected with the inverse output terminal that active two ports of the first described standard amplify network (1), and its different name end is connected with one end of load; The Same Name of Ends of described the first transformer (2) secondary coil is connected with the in-phase input end that active two ports of the first described standard amplify network (1), its different name end ground connection; The Same Name of Ends of described the second transformer (2) primary coil is connected with the inverse output terminal that active two ports of the second described standard amplify network (1), and its different name end is connected with the other end of load; The Same Name of Ends of described the second transformer (2) secondary coil is connected with the in-phase input end that active two ports of the second described standard amplify network (1), its different name end ground connection; One end of described passive device (3) connects inverting input and the in-phase output end of the active two ports amplification networks (1) of the first described standard simultaneously, and its other end connects inverting input and the in-phase output end of the active two ports amplification networks (1) of the second described standard simultaneously; The differential current signal that active two ports of first, second described standard amplify the reversed-phase output output of networks (1) is flowed through respectively after the primary coil of first, second transformer (2) and is exported load to; Described first, second transformer (2) has high turn ratio and high magnetic coefficient simultaneously.

2. a kind of fully differential power current amplifier according to claim 1, is characterized in that: the output signal that active two ports of first, second described standard amplify network (1) is current signal.

3. a kind of fully differential power current amplifier according to claim 1, it is characterized in that: in described feedback network, first, second transformer (2) forms two negative feedback networks that configuration is current parallel, passive device (3) forms two negative feedback networks that configuration is current-series.

4. a kind of fully differential power current amplifier according to claim 1, is characterized in that: described passive device (3) can be any in resistance, inductance or microstrip line.