US3811098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transformerless full wave rectifier and direct coupled product modulator
Assignee: Singer Co
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Filing: 1973-02-05
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Granted: 1974-05-14
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Expires: 1993-02-05
Abstract
Abstract A circuit which in one configuration may be used as a rectifier and in another configuration as a direct coupled product modulator comprising a pair of transistors coupled to the input, a first integrated circuit amplifier controlling the transistors and a second integrated circuit amplifier obtaining its input inverting input from one transistor and its non-inverting input from the other and providing the final output is shown. In the rectifier configuration the signal to be rectified is applied to both the two transistors and the first amplifier with the amplifier output selectively grounding a respective one of the transistors on respective positive and negative cycles causing the second amplifier to output a uni-polar signal. In the modulator configuration the carrier is applied to the first amplifier and will modulate the signal input to the transistors through similar grounding action. Both configurations are able to handle small signals and provide variable gain a feature not present in prior art devices using transformers.
Inventors
- 👤 A Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:59
CPC Classifications
H; H03; H03C; H03C1/00; H03C1/52; H03C1/54; H03C1/542; H03C1/545; H03D; H03D1/00; H03D1/22
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
140 words
A full wave rectifier comprising: a. an input terminal; b. a differential amplifier having its non-inverting terminal coupled to said input terminal and its inverting input terminal coupled to ground; c. a PNP transistor having its emitter coupled through a resistor to said input terminal, its collector grounded and its base coupled to the output of said differential amplifier; d. an NPN transistor having its emitter coupled through a second resistor to said input terminal, its collector coupled to ground and its base coupled to said differential amplifier; e. an operational amplifier having its inverting input coupled through a third resistor to the emitter of said PNP transistor and through a fourth resistor to its output, and having its non-inverting input coupled through a fifth resistor to the emitter of said NPN resistor and through a sixth resistor to ground.
Claim 2
Dependent Claim
140 words
A full wave rectifier comprising: a. an input terminal; b. a differential amplifier having its non-inverting terminal coupled to said input terminal and its inverting input terminal coupled to ground; c. a PNP transistor having its emitter coupled through a resistor to said input terminal, its collector grounded and its base coupled to the output of said differential amplifier; d. an NPN transistor having its emitter coupled through a second resistor to said input terminal, its collector coupled to ground and its base coupled to said differential amplifier; e. an operational amplifier having its inverting input coupled through a third resistor to the emitter of said PNP transistor and through a fourth resistor to its output, and having its non-inverting input coupled through a fifth resistor to the emitter of said NPN resistor and through a sixth resistor to ground.
Claim 3
Dependent Claim
51 words
The invention according to claim 1 wherein said first, second, third and fifth resistors have a relative value R, said fourth resistor has a relative value 2 AR and said sixth resistor has a relative value 2 AR/A + 1 where A is equal to the amplification of said operational amplifier.
Claim 4
Dependent Claim
17 words
The invention according to claim 1 wherein said differential amplifier and said operational amplifier are microcircuit amplifiers.
Claim 5
Dependent Claim
143 words
A modulator for modulating a carrier by a signal comprising: a. a signal input terminal; b. a differential amplifier having its inverting input grounded and the carrier signal provided to its non-inverting input; c. a PNP transistor having its emitter coupled through a resistor to said input terminal, its collector grounded and its base coupled to the output of said differential amplifier; d. an NPN transistor having its emitter coupled through a second resistor to said input terminal, its collector coupled to ground and its base coupled to said differential amplifier; e. an operational amplifier having its inverting input coupled through a third resistor to the emitter of said PNP transistor and through a fourth resistor to its output, and having its non-inverting input coupled through a fifth resistor to the emitter of said NPN resistor and through a sixth resistor to ground.
Claim 6
Dependent Claim
143 words
A modulator for modulating a carrier by a signal comprising: a. a signal input terminal; b. a differential amplifier having its inverting input grounded and the carrier signal provided to its non-inverting input; c. a PNP transistor having its emitter coupled through a resistor to said input terminal, its collector grounded and its base coupled to the output of said differential amplifier; d. an NPN transistor having its emitter coupled through a second resistor to said input terminal, its collector coupled to ground and its base coupled to said differential amplifier; e. an operational amplifier having its inverting input coupled through a third resistor to the emitter of said PNP transistor and through a fourth resistor to its output, and having its non-inverting input coupled through a fifth resistor to the emitter of said NPN resistor and through a sixth resistor to ground.
Claim 7
Dependent Claim
52 words
The invention according to claim 4 wherein said first, second, third and fifth resistors have a relative value R and said fourth resistor has a relative value 2 AR and said sixth resistor has a relative value 2 AR/A + 1 where A is equal to the amplification of said operational amplifier.
Claim 8
Dependent Claim
17 words
The invention according to claim 4 wherein said differential amplifier and said operational amplifier are microcircuit amplifiers.
Claim 9
Dependent Claim
20 words
The invention according to claim 4 wherein said first, second, third, fourth, fifth and sixth resistors are all precision resistors.
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) | 1977-05-13 | 1977-11-12 | 1978-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-13 | 1981-11-12 | 1982-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-13 | 1985-11-12 | 1986-05-14 | $7700.00 | Window Closed / Lapsed |