US3852676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detector circuit
Assignee: Sony Corp
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Filing: 1973-04-26
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Granted: 1974-12-03
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Expires: 1993-04-26
Abstract
Abstract The detector circuit is divided into two parts, a signal current input section and a detector section. The signal current input section includes an input terminal which is supplied with a signal to be detected and which is connected to the base electrode of a first transistor whose collector electrode is connected through a first impedance to a first terminal of a voltage source and whose emitter electrode is connected through a second impedance to a second terminal of a voltage source. The detector section includes a second transistor whose collector electrode is connected through a load impedance to the first terminal of the voltage source and whose emitter electrode is connected through a diode to a second terminal of the voltage source, the diode being connected such that its conductive polarity is the same as the conductive polarity of the junction between the base and emitter electrodes of the second transistor with respect to the voltage source. Means are provided for connecting the emitter electrode of the second transistor to the collector electrode of the first transistor and the base electrode of the second transistor is based so that a small current flows through the second transistor and the diode when no input signal current is supplied. The output from the detector circuit is delivered at the collector electrode of the second transistor so that the detector circuit operates with great linearity over a wide range of input signal values.
Inventors
- 👤 M Hongu
- 👤 I Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:05
CPC Classifications
H; H03; H03D; H03D1/00; H03D1/14; H03D1/18
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
233 words
A detector circuit comprising: A. a power source having first and second voltage terminals, B. signal current input means comprising first and second constant current circuits connected in series between the first and second voltage terminals, the first constant current circuit supplying a direct current I1, means for superposing an input signal current + OR - Delta i on the current I1, the second current source supplying a direct current I2, the direction of the currents I1 and I2 being the same with respect to the first and second voltage terminals, and the value of the currents I1 and I2 being substantially the same; and C. detector means comprised of a series circuit connected between said first and second voltage terminals, said series circuit including a transistor having input and output terminals for providing a detected signal at the output terminal in response to the input signal current + OR - Delta i supplied to the input terminal, a load impedance connected to said output terminal and a diode connected to said input terminal and poled to conduct current when said transistor is conductive said input terminal being further connected to a connection point between the first and second constant current circuits, and said transistor being biased to a predetermined state of conductivity such that the transistor bias is varied as a function of said input signal current supplied to said input terminal.
Claim 2
Dependent Claim
233 words
A detector circuit comprising: A. a power source having first and second voltage terminals, B. signal current input means comprising first and second constant current circuits connected in series between the first and second voltage terminals, the first constant current circuit supplying a direct current I1, means for superposing an input signal current + OR - Delta i on the current I1, the second current source supplying a direct current I2, the direction of the currents I1 and I2 being the same with respect to the first and second voltage terminals, and the value of the currents I1 and I2 being substantially the same; and C. detector means comprised of a series circuit connected between said first and second voltage terminals, said series circuit including a transistor having input and output terminals for providing a detected signal at the output terminal in response to the input signal current + OR - Delta i supplied to the input terminal, a load impedance connected to said output terminal and a diode connected to said input terminal and poled to conduct current when said transistor is conductive said input terminal being further connected to a connection point between the first and second constant current circuits, and said transistor being biased to a predetermined state of conductivity such that the transistor bias is varied as a function of said input signal current supplied to said input terminal.
Claim 3
Dependent Claim
143 words
A detector circuit according to claim 1; wherein the signal current input means comprises: A. a signal input terminal supplied with a signal to be detected; B. a further transistor having base, emitter, and collector electrodes; C. first impedance means connected between the collector electrode and the first voltage terminal; D. second impedance means connected between the emitter electrode and the second voltage terminal; E. means for biasing the base electrode and including means for connecting the input terminal to the base electrode for applying the signal to be detected thereto; and F. means for connecting the collector electrode to the input terminal of the detector means; whereby the signal to be detected is converted to the input signal current + or -Delta i by the further transistor and is supplied to the input terminal of the detector means from the collector electrode.
Claim 4
Dependent Claim
18 words
A detector circuit according to claim 2; wherein the first impedance means is an L-C parallel resonance circuit.
Claim 5
Dependent Claim
253 words
A detector circuit comprising: a voltage source; signal current input means comprising first and second constant current circuits connected in series to said voltage source, the first constant current circuit supplying a direct current I1, means for superposing an input signal current + or -Delta i on the current I1, the second current source supplying a direct current I2, the direction of the currents I1 and I2 being the same and the value of the currents I1 and I2 being substantially the same; detector means having input and output terminals for providing a detected signal at the output terminal in response to the input signal current + or - Delta i supplied to the input terminal, the input terminal being connected to a connection point between the first and second constant current circuits, the detector means including: a first transistor having base, emitter, and collector electrodes; load impedance means connected between the collector electrode and the voltage source; a diode connected to the emitter electrode so that the diode has the same direction of conductive polarity with respect to the voltage source as the junction between the base and emitter electrodes; means for connecting the input terminal of the detector means to a connection point between the emitter and the diode; biasing means for biasing the base electrode so that a small current flows through both the transistor and the diode when no input signal current is supplied; and means for connecting the collector electrode to the output terminal of the detector means.
Claim 6
Dependent Claim
253 words
A detector circuit comprising: a voltage source; signal current input means comprising first and second constant current circuits connected in series to said voltage source, the first constant current circuit supplying a direct current I1, means for superposing an input signal current + or -Delta i on the current I1, the second current source supplying a direct current I2, the direction of the currents I1 and I2 being the same and the value of the currents I1 and I2 being substantially the same; detector means having input and output terminals for providing a detected signal at the output terminal in response to the input signal current + or - Delta i supplied to the input terminal, the input terminal being connected to a connection point between the first and second constant current circuits, the detector means including: a first transistor having base, emitter, and collector electrodes; load impedance means connected between the collector electrode and the voltage source; a diode connected to the emitter electrode so that the diode has the same direction of conductive polarity with respect to the voltage source as the junction between the base and emitter electrodes; means for connecting the input terminal of the detector means to a connection point between the emitter and the diode; biasing means for biasing the base electrode so that a small current flows through both the transistor and the diode when no input signal current is supplied; and means for connecting the collector electrode to the output terminal of the detector means.
Claim 7
Dependent Claim
61 words
A detector circuit according to claim 4; wherein the detector means further includes a second transistor having base, emitter, and collector electrodes, the base anD collector electrodes of the second transistor being connected to the emitter and collector electrodes of the first transistor, respectively, and the emitter electrode of the second transistor being connected to a terminal of the voltage source.
Claim 8
Dependent Claim
152 words
A detector circuit according to claim 5; wherein the signal current input means comprises: A. a signal input terminal supplied with a signal to be detected; B. a third transistor having base, emitter, and collector electrodes; C. first impedance means connected between the collector electrode of the third transistor and the voltage source; D. second impedance means connected in series with the emitter electrode of the third transistor; E. means for connecting the input terminal to the base electrode of the third transistor for applying the signal to be detected thereto; and F. means for connecting the collector electrode of the third transistor to the input terminal of the detector means, whereby the signal to be detected is converted to the input signal current + or - Delta i by the third transistor and is supplied to the input terminal of the detector means from the collector electrode of the third transistor.
Claim 9
Dependent Claim
18 words
A detector circuit according to claim 6; wherein the first impedance means is an L-C parallel resonance circuit.
Claim 10
Dependent Claim
152 words
A detector circuit according to claim 4; wherein the signal current input means comprises: A. a signal input terminal supplied with a signal to be detected; B. a second transistor having base, emitter, and collector electrodes; C. first impedance means connected between the collector electrode of the second transistor and the voltage source; D. second impedance means connected in series with the emitter electrode of the second transistor; E. means for connecting the input terminal to the base electrode of the second transistor for applying the signal to be detected thereto; and F. means for connecting the collector electrode of the second transistor to the input terminal of the detector means; whereby the signal to be detected is converted to the input signal current + or - Delta i by the second transistor and is supplied to the input terminal of the detector means from the collector electrode of the second transistor.
Claim 11
Dependent Claim
18 words
A detector circuit according to claim 8; wherein the first impedance means is an L-C parallel resonance circuit.
Claim 12
Dependent Claim
141 words
A detector circuit comprising: A. a voltage source having a pair of terminals; B. a first transistor having base, emitter, and collector electrodes; C. load impedance means connected between the collector electrode and one of the pair of terminals; D. a diode connected between the emitter electrode and the other of the pair of terminals so that the diode has the same direction of conductive polarity as the junction between base and emitter electrodes with respect to the voltage source; E. signal current input means supplying a signal current + or -Delta i to a connection point between the emitter and the diode; F. biasing means for biasing the base electrode so that a small current flows through both the transistor and the diode when no input signal current is supplied; and G. an output terminal connected to the collector electrode.
Claim 13
Dependent Claim
141 words
A detector circuit comprising: A. a voltage source having a pair of terminals; B. a first transistor having base, emitter, and collector electrodes; C. load impedance means connected between the collector electrode and one of the pair of terminals; D. a diode connected between the emitter electrode and the other of the pair of terminals so that the diode has the same direction of conductive polarity as the junction between base and emitter electrodes with respect to the voltage source; E. signal current input means supplying a signal current + or -Delta i to a connection point between the emitter and the diode; F. biasing means for biasing the base electrode so that a small current flows through both the transistor and the diode when no input signal current is supplied; and G. an output terminal connected to the collector electrode.
Claim 14
Dependent Claim
62 words
A detector circuit according to claim 10; wherein the detector means further includes a second transistor having base, emitter, and collector electrodes, the base and collector electrodes of the second transistor being connected to the emitter and collector electrodes of the first transistor, respectively, and the emitter electrode of the second transistor being connected to the other of the pair of terminals.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |