US4825104A
Expired / Lapsed
US
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Comparator
Assignee: Nippon Precision Circuits Inc
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Filing: 1987-09-29
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Granted: 1989-04-25
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Expires: 2007-09-29
Abstract
Abstract A comparator which sets the comparison level depending on the number of transistors used easily ascertains the relative accuracy of the load resistors, is suitable for integration and improves the relative accuracy of input DC biases.
Inventors
- 👤 Akira Yamakoshi
- 👤 Toyohiko Fujita
- 👤 Kunihiko Tsukakoshi
- 👤 Kazuhisa Mito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:01
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/45; H03K; H03K5/00; H03K5/22; H03K5/24; H03K5/2409; H03K5/2418; H03K5/01; H03K5/02
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
170 words
A comparator comprising: a first circuit including m(m=1, 2 . . . ) transistors connected in parallel for receiving a first input signal at each respective base of the transistors; a second circuit including n(n=1, 2 . . . where n≠m) transistors connected in parallel for receiving a second input signal at each respective base of the transistors; a first load resistor connected in series with the first circuit, and a second load resistor having the same resistance as the first load resistor and connected in series with the second circuit; said first circuit and said first load resistor constituting a first series-connected circuit, and said second circuit and said second load resistor consituting a second series-connected circuit, said first series-connected circuit and said second series-connected circuit each being connected in parallel with a common power source; and a differential amplifier having input terminals respectively connected to a junction of the first load resistor and the first circuit and a junction of the second load resistor and the second circuit.
Claim 2
Dependent Claim
170 words
A comparator comprising: a first circuit including m(m=1, 2 . . . ) transistors connected in parallel for receiving a first input signal at each respective base of the transistors; a second circuit including n(n=1, 2 . . . where n≠m) transistors connected in parallel for receiving a second input signal at each respective base of the transistors; a first load resistor connected in series with the first circuit, and a second load resistor having the same resistance as the first load resistor and connected in series with the second circuit; said first circuit and said first load resistor constituting a first series-connected circuit, and said second circuit and said second load resistor consituting a second series-connected circuit, said first series-connected circuit and said second series-connected circuit each being connected in parallel with a common power source; and a differential amplifier having input terminals respectively connected to a junction of the first load resistor and the first circuit and a junction of the second load resistor and the second circuit.
Claim 3
Dependent Claim
24 words
The comparator of claim 1; wherein each of said transistors of said first circuit is of the same type connected with the same orientation.
Claim 4
Dependent Claim
24 words
The comparator of claim 1; wherein each of said transistors of said second circuit is of the same type connected with the same orientation.
Claim 5
Dependent Claim
26 words
The comparator of claim 1; wherein each of said transistors of said first and second circuits is of the same type connected with the same orientation.
Claim 6
Dependent Claim
14 words
The comparator of claim 1; wherein each transistor is connected to said differential amplifier.
Claim 7
Dependent Claim
39 words
The comparator of claim 1; wherein each transistor of said first circuit is connected to a first terminal of said differential amplifier and each transistor of said second circuit is connected to a second terminal of said differential amplifier.
Claim 8
Dependent Claim
21 words
The comparator of claim 6; wherein the collectors of each transistor of said first circuit are connected to said first terminal.
Claim 9
Dependent Claim
21 words
The comparator of claim 6; wherein the collectors of each transistor of said second circuit are connected to said second terminal.
Claim 10
Dependent Claim
173 words
A comparator comprising: a first circuit including m(m=2, 3 . . . ) transistors connected in parallel for receiving a first input signal at each respective base of the transistors; a second circuit including n(n=1, 2 . . . where n<m) transistors connected in parallel for receiving a second input signal at each respective base of the transistors; a third circuit including (m-n) transistors connected in parallel and receiving the second input signal at each respective base of the transistors; a first load resistor through which the first circuit is connected to a power source, and a second load resistor having the same resistance as the first load resistor and through which the second circuit is connected to the power source; said third circuit connected in parallel with a series-connected circuit including the second load resistor and the second circuit; and a differential amplifier having input terminals respectively connected to a junction of the first load resistor and the first circuit and a junction of the second load resistor and the second circuit.
Claim 11
Dependent Claim
173 words
A comparator comprising: a first circuit including m(m=2, 3 . . . ) transistors connected in parallel for receiving a first input signal at each respective base of the transistors; a second circuit including n(n=1, 2 . . . where n<m) transistors connected in parallel for receiving a second input signal at each respective base of the transistors; a third circuit including (m-n) transistors connected in parallel and receiving the second input signal at each respective base of the transistors; a first load resistor through which the first circuit is connected to a power source, and a second load resistor having the same resistance as the first load resistor and through which the second circuit is connected to the power source; said third circuit connected in parallel with a series-connected circuit including the second load resistor and the second circuit; and a differential amplifier having input terminals respectively connected to a junction of the first load resistor and the first circuit and a junction of the second load resistor and the second circuit.
Claim 12
Dependent Claim
24 words
The comparator of claim 9; wherein each of said transistors of said first circuit is of the same type connected with the same orientation.
Claim 13
Dependent Claim
24 words
The comparator of claim 9; wherein each of said transistors of said second circuit is of the same type connected with the same orientation.
Claim 14
Dependent Claim
26 words
The comparator of claim 9; wherein each of said transistors of said first and second circuits is of the same type connected with the same orientation.
Claim 15
Dependent Claim
14 words
The comparator of claim 9; wherein each transistor is connected to said differential amplifier.
Claim 16
Dependent Claim
39 words
The comparator of claim 9; wherein each transistor of said first circuit is connected to a first terminal of said differential amplifier and each transistor of said second circuit is connected to a second terminal of said differential amplifier.
Claim 17
Dependent Claim
21 words
The comparator of claim 9; wherein the collectors of each transistor of said first circuit are connected to said first terminal.
Claim 18
Dependent Claim
21 words
The comparator of claim 9; wherein the collectors of each transistor of said second circuit are connected to said second terminal.
References Cited (Backward Citations)
US4563597A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-24 | 1992-10-24 | 1993-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-24 | 1996-10-24 | 1997-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-24 | 2000-10-24 | 2001-04-25 | $7700.00 | Window Closed / Lapsed |