GB1402546A - Adjustable frequency oscillator - Google Patents
Adjustable frequency oscillatorInfo
- Publication number
- GB1402546A GB1402546A GB3323671A GB3323671A GB1402546A GB 1402546 A GB1402546 A GB 1402546A GB 3323671 A GB3323671 A GB 3323671A GB 3323671 A GB3323671 A GB 3323671A GB 1402546 A GB1402546 A GB 1402546A
- Authority
- GB
- United Kingdom
- Prior art keywords
- output
- integrator
- transformer
- coupling
- feedback
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K4/00—Generating pulses having essentially a finite slope or stepped portions
- H03K4/06—Generating pulses having essentially a finite slope or stepped portions having triangular shape
- H03K4/066—Generating pulses having essentially a finite slope or stepped portions having triangular shape using a Miller-integrator
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/20—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator
- H03B5/24—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator active element in amplifier being semiconductor device
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K4/00—Generating pulses having essentially a finite slope or stepped portions
- H03K4/94—Generating pulses having essentially a finite slope or stepped portions having trapezoidal shape
Landscapes
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
1402546 Transducer circuits IMPERIAL CHEMICAL INDUSTRIES Ltd 13 July 1972 [15 July 1971] 33236/71 Heading G1N [Also in Divisions H3 and H4] A transducer controlled variable frequency oscillator comprises a capacitive feedback integrator 12 followed by a Schmitt type switch 10 providing a bi-polar output which switches when the input is a predetermined fraction of and of opposite polarity to the output, and a variable coupling unit including a transformer L 1 coupling the output of the switch to the input of the integrator. Zener diodes 24 limit the output levels of the switch and a resistor R4 in the feedback path of the integrator advances the phase and so steepens the output edges. In order to maintain positive feedback when the output of the transformer is pbsitive or negative the integrator is biased by means of a resistor R5 which may be variable continuously or discretely. The coupling unit includes an amplifier 34 having a feedback circuit matched in time constant to that of the transformer to compensate for low frequency loss. As shown, the coupling is varied by means of a core 32 sensitive to the load or pressure but in Fig. 6 (not shown) the secondary of the transformer feeds into a bridge network which responds to a quantity to be measured to effect the variation.
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3323671A GB1402546A (en) | 1971-07-15 | 1971-07-15 | Adjustable frequency oscillator |
FR7225049A FR2145583B1 (en) | 1971-07-15 | 1972-07-11 | |
DE19722234757 DE2234757A1 (en) | 1971-07-15 | 1972-07-14 | ADJUSTABLE FREQUENCY OSCILLATOR |
CA147,189A CA987008A (en) | 1971-07-15 | 1972-07-14 | Adjustable frequency oscillator |
IT2697872A IT962837B (en) | 1971-07-15 | 1972-07-14 | VARIABLE FREQUENCY OSCILLATOR |
JP47071186A JPS5818014B2 (en) | 1971-07-15 | 1972-07-15 | variable frequency oscillator |
US415320A US3883826A (en) | 1971-07-15 | 1973-11-13 | Adjustable frequency oscillator with regenerative feedback and a coupling unit including a differential amplifier for adjusting the feedback |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3323671A GB1402546A (en) | 1971-07-15 | 1971-07-15 | Adjustable frequency oscillator |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1402546A true GB1402546A (en) | 1975-08-13 |
Family
ID=10350312
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3323671A Expired GB1402546A (en) | 1971-07-15 | 1971-07-15 | Adjustable frequency oscillator |
Country Status (6)
Country | Link |
---|---|
JP (1) | JPS5818014B2 (en) |
CA (1) | CA987008A (en) |
DE (1) | DE2234757A1 (en) |
FR (1) | FR2145583B1 (en) |
GB (1) | GB1402546A (en) |
IT (1) | IT962837B (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2726894A1 (en) * | 1977-06-15 | 1979-01-04 | Bosch Gmbh Robert | CIRCUIT DEVICE FOR CONVERTING AN INDUCTIVITY VALUE INTO A SPECIFIC FREQUENCY |
DE4220596C1 (en) * | 1992-06-24 | 1993-12-09 | Mfp Mestechnik Und Fertigungst | Transmission factor measuring circuit for variable transmission circuit e.g. differential transformer path sensor - determines factor from difference in period of oscillation of series integrator and comparator oscillator when circuit is connected and disconnected. |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4425765Y1 (en) * | 1967-09-26 | 1969-10-29 |
-
1971
- 1971-07-15 GB GB3323671A patent/GB1402546A/en not_active Expired
-
1972
- 1972-07-11 FR FR7225049A patent/FR2145583B1/fr not_active Expired
- 1972-07-14 CA CA147,189A patent/CA987008A/en not_active Expired
- 1972-07-14 DE DE19722234757 patent/DE2234757A1/en not_active Withdrawn
- 1972-07-14 IT IT2697872A patent/IT962837B/en active
- 1972-07-15 JP JP47071186A patent/JPS5818014B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
CA987008A (en) | 1976-04-06 |
JPS4857569A (en) | 1973-08-13 |
FR2145583A1 (en) | 1973-02-23 |
FR2145583B1 (en) | 1976-05-14 |
DE2234757A1 (en) | 1973-02-01 |
JPS5818014B2 (en) | 1983-04-11 |
IT962837B (en) | 1973-12-31 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |