US3673506A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic phase sensitive detector circuits
Assignee: Brookdeal Electronics Ltd
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Filing: 1971-02-16
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Granted: 1972-06-27
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Expires: 1991-02-16
Abstract
Abstract A phase-sensitive detector circuit comprises two long-tailed pairs of transistors of complementary type connected together and switched by a reference signal so that the transistors of each pair joined to each other conduct simultaneously. The signal input is applied to a tail of one of the pairs and a feedback circuit operates to control the tail of the other pair to tend to maintain the mean voltage at a junction point between the two pairs at a constant value. A resistance is connected across the junctions between the pairs and the output is taken differentially from the junctions.
Inventors
- 👤 Eric Andrew Faulkner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:05
CPC Classifications
H; H03; H03D; H03D1/00; H03D1/22; H03D1/229
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
172 words
An electronic phase-sensitive detector circuit comprising two sections, one section comprisiNg a first signal translation device and a load therefor consisting of two parallel paths each including current-switching means and the other section comprising a second signal translation device and a load therefor consisting of two parallel paths each including current-switching means, means for applying reference signals to each section to cause one or other of the switching means of each section to conduct depending on the polarities of the reference signals, junctions between the paths of one section and the paths of the other section to enable those paths joined to each other through the junctions conduct simultaneously, means for applying an input signal waveform to the first signal translation device, feedback means controlled by the mean voltage of one of the junctions for controlling the second signal translation device in a manner to tend to maintain said mean voltage constant, a resistive connection between the respective junctions, and signal output means for combining the voltages at both the junctions differentially.
Claim 2
Dependent Claim
172 words
An electronic phase-sensitive detector circuit comprising two sections, one section comprisiNg a first signal translation device and a load therefor consisting of two parallel paths each including current-switching means and the other section comprising a second signal translation device and a load therefor consisting of two parallel paths each including current-switching means, means for applying reference signals to each section to cause one or other of the switching means of each section to conduct depending on the polarities of the reference signals, junctions between the paths of one section and the paths of the other section to enable those paths joined to each other through the junctions conduct simultaneously, means for applying an input signal waveform to the first signal translation device, feedback means controlled by the mean voltage of one of the junctions for controlling the second signal translation device in a manner to tend to maintain said mean voltage constant, a resistive connection between the respective junctions, and signal output means for combining the voltages at both the junctions differentially.
Claim 3
Dependent Claim
32 words
The circuit as claimed in claim 1 in which the current-switching means comprise transistors and the transistors of one section are of opposite conductivity type to the transistors of the other section.
Claim 4
Dependent Claim
60 words
The circuit as claimed in claim 1 in which the feedback means comprises a pair of field-effect transistors connected as a long-tailed pair, the gates of the field-effect transistors being connected respectively to a point of fixed reference potential and to one of the junctions, and a connection from one of the field-effect transistors to control the second translation device.
Claim 5
Dependent Claim
29 words
The circuit as claimed in claim 1 in which the output means comprises a long-tailed pair of field-effect transistors the gates of which are connected to the respective junctions.
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |