CN108900186A

CN108900186A - A kind of PA or LNA circuit with front end transformer

Info

Publication number: CN108900186A
Application number: CN201810794726.5A
Authority: CN
Inventors: 王雅珍; 陈磊
Original assignee: CHIZHU RUICHENG MICROELECTRONICS Co Ltd
Current assignee: CHIZHU RUICHENG MICROELECTRONICS Co Ltd
Priority date: 2018-07-19
Filing date: 2018-07-19
Publication date: 2018-11-27

Abstract

The invention discloses a kind of PA or LNA circuits with front end transformer, including：LNA is connected to PA power supply, is connected under PA mode across two sub- transformers, the center tap node CTAP1, CTAP2 of sub- transformer；Adjacent PA branch（Every sub- PA has 18 half-cells）It closes, and the capacitor as LNA input terminal；Side PA branch（Every sub- PA has 20 half-cells）Conducting is to create the DC input of LNA to ground；Two intermediate Cc are the boost capacitors of LNA, and it is the balanced load under PA mode that in addition there are two external Cc；Circuit further includes three additional independent switches.A kind of PA or LNA circuit with front end transformer of the present invention only just completes the mutual conversion of PA and LNA by using DC power supply switch, and PA output and LNA input shared a port, is not necessarily to special technique or technique, such as stack switch or isolation well.

Description

A kind of PA or LNA circuit with front end transformer

Technical field

The present invention relates to power amplifier field more particularly to a kind of PA or LNA circuits with front end transformer.

Background technique

In a tdd system, emit and RX path works in the same frequency range of shared antenna.TRSW TX and RX it Between selected, and it is the two is mutually isolated.Under TX mode, switch shields receiver under high PA output power, and Under RX mode, switch can prevent idle PA from providing leakage paths in RX input terminal or increasing noise.In addition to powerful isolation, TRSW There must also be low IL, to reduce PA output power, PA efficiency and RX noise coefficient to the maximum extent（NF）With sensitivity Degrade.In order to meet isolation and IL requirement, many business TRSW modules still use expensive material, such as GaAs or thick film SOI To realize pHEMT or pin diode switch device.Allowed since the high output voltage amplitude of oscillation of PA has exceeded modern cmos device Range, second, the low substrate resistance of silicon cause under gigahertz frequencies leak and be lost, so TRSW is integrated into body silicon It is challenging in technique.In the investigation to the SoC system delivered, the T/R or frequency band that many does not still integrate are cut Change function.

Summary of the invention

To solve the above-mentioned problems, the present invention provides the CMOS wireless TDD front ends of 65nm a kind of.

Embodiment：

A kind of PA or LNA circuit with front end transformer, including LNA, transformer, there are two the transformers, and the LNA is horizontal Across two transformers, the center tap node CTAP1, CTAP2 of transformer are connected to PA power supply, and adjacent PA branch closes, and Capacitor as LNA input terminal；Side PA branch leading creates the DC input of LNA to ground, and two intermediate Cc are the boosting of LNA Capacitor, in addition there are two the balanced load that external Cc is under PA mode, circuit is also set up there are three additional independent switch.

Further, every sub- PA of adjacent PA branch has 18 half-cells, and every sub- PA of side PA branch has 20 A half-cell.

Further, first row transistor is PA input equipment in PA mode, by switch input driving.

Further, switch SW1 and SW2 selects on-off, LNA power supply between the LNA load of LNA branch and the ground of PA Switch SW1 is located at the centre cap of LNA shunted resistively inductance, is located at except signal path, PA earthing switch SW2 is located at the output of LNA At node.

Beneficial effect：The present invention only just completes the mutual conversion of PA and LNA by using DC power supply switch, PA output and LNA inputs shared a port, is not necessarily to special technique or technique, such as stack switch or isolation well, ingenious in design.

Detailed description of the invention

Fig. 1 is PA or LNA circuit diagram of the present invention；

Fig. 2 is PA or LNA circuit PA mode of the present invention and LNA mode schematic diagram.

Specific embodiment

Detailed description of the preferred embodiments with reference to the accompanying drawing.

As shown, a kind of PA or LNA circuit with front end transformer, LNA is across two sub- transformers, sub- transformation The center tap node CTAP1, CTAP2 of device are connected to PA power supply, are connected under PA mode；Adjacent PA branch（Every sub- PA There are 18 half-cells）It closes, and the capacitor as LNA input terminal；Side PA branch（Every sub- PA has 20 half-cells）Conducting To create the DC input of LNA to ground；Two intermediate Cc are the boost capacitors of LNA, and it is PA mould that in addition there are two external Cc Balanced load under formula；Circuit further includes three additional independent switches.

First row transistor is PA input equipment in PA mode, by switch input driving.

Switch SW1 and SW2 selects on-off between the LNA load of LNA branch and the ground of PA.LNA power switch SW1 In the centre cap of LNA shunted resistively inductance, it is located at except signal path, can be arbitrarily sized, without is generated not to performance Benefit influences.PA earthing switch SW2 occurs at the output node of LNA, and its size must be relatively small so that load is minimum Change.

The present invention only just completes the mutual conversion of PA and LNA by using DC power supply switch, and PA output and LNA input are altogether A port is enjoyed, special technique or technique, such as stack switch or isolation well are not necessarily to, it is ingenious in design.

The basic principles, main features and advantages of the present invention have been shown and described above.The present invention is not by upper The limitation of embodiment is stated, the above embodiments and description only illustrate the principle of the present invention, is not departing from the present invention Various changes and improvements may be made to the invention under the premise of spirit and scope, these changes and improvements both fall within claimed In the range of invention.The claimed scope of the invention is defined by appended claims and its equivalent.

Claims

1. a kind of PA or LNA circuit with front end transformer, it is characterised in that：Including LNA, transformer, the transformer has Two, the LNA is across two transformers, and the center tap node CTAP1 of transformer, CTAP2 is connected to PA power supply, adjacent PA branch closes, and the capacitor as LNA input terminal；The DC that side PA branch leading creates LNA to ground is inputted, and intermediate two Cc is the boost capacitor of LNA, and in addition there are two the balanced load that external Cc is under PA mode, circuit is also set up there are three attached The independent switch added.

2. a kind of PA or LNA circuit with front end transformer according to claim 1, it is characterised in that：Adjacent PA points Every sub- PA of branch has 18 half-cells, and every sub- PA of side PA branch has 20 half-cells.

3. a kind of PA or LNA circuit with front end transformer according to claim 1, it is characterised in that：In PA mode First row transistor is PA input equipment, by switch input driving.

4. a kind of PA or LNA circuit with front end transformer according to claim 1, it is characterised in that：Switch SW1 and SW2 selects on-off between the LNA load of LNA branch and the ground of PA, and LNA power switch SW1 is located in LNA shunted resistively inductance At heart tap, it is located at except signal path, PA earthing switch SW2 is located at the output node of LNA.