Patent US3294053A successfully refreshed from Google Patents.
Patent US6150852A successfully refreshed from Google Patents.
US6150852A
Expired / Lapsed
US
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Active differential to single-ended converter
Assignee: Qualcomm Inc
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Filing: 1999-01-14
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Granted: 2000-11-21
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Expires: 2019-01-14
Abstract
Abstract Many applications require the conversion of a differential current signal into a single-ended signal. The shortcomings encountered with existing approaches include poor conversion efficiency, limited bandwidth, and large size. The converter disclosed uses active devices to obtain a unit of small size and high efficiency having a wide bandwidth of operation.
Inventors
- 👤 Vladimir Aparin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:33
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/45; H03F3/45071; H03H; H03H11/00; H03H11/02; H03H11/32; H03H7/00; H03H7/42
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
118 words
A circuit for converting a differential current signal to a single-ended signal, comprising: an active device having a control terminal, a charge-producing terminal, and a charge-collecting terminal; and a resistance having two terminals; wherein a bias potential is applied at least indirectly to the charge-producing terminal of said active device; and wherein one of the two terminals of said resistance is connected to the charge-collecting terminal of said active device, and the other of the two terminals of said resistance is connected to the control terminal of said active device; and wherein the differential current signal is applied to the terminals of the resistance, and the single-ended signal is outputted at the charge-collecting terminal of said active device.
Claim 2
Dependent Claim
118 words
A circuit for converting a differential current signal to a single-ended signal, comprising: an active device having a control terminal, a charge-producing terminal, and a charge-collecting terminal; and a resistance having two terminals; wherein a bias potential is applied at least indirectly to the charge-producing terminal of said active device; and wherein one of the two terminals of said resistance is connected to the charge-collecting terminal of said active device, and the other of the two terminals of said resistance is connected to the control terminal of said active device; and wherein the differential current signal is applied to the terminals of the resistance, and the single-ended signal is outputted at the charge-collecting terminal of said active device.
Claim 3
Dependent Claim
24 words
A circuit for converting a differential current signal to a single-ended signal according to claim 1, wherein said active device is a field-effect transistor.
Claim 4
Dependent Claim
25 words
A circuit for converting a differential current signal to a single-ended signal according to claim 1, wherein said active device is a bipolar junction transistor.
Claim 5
Dependent Claim
40 words
A circuit for converting a differential current signal to a single-ended signal according to claim 1, wherein said active device is selected from the group consisting of a metal-semiconductor field-effect transistor, a heterojunction bipolar junction transistor, and a high-electron-mobility transistor.
Claim 6
Dependent Claim
64 words
A circuit for converting a differential current signal to a single-ended signal according to claim 1, further comprising a direct current source having two terminals, wherein the bias potential is applied to one of the two terminals of said direct current source, and the other of the two terminals of said direct current source is connected to the control terminal of said active device.
Claim 7
Dependent Claim
24 words
A circuit for converting a differential current signal to a single-ended signal according to claim 5, wherein said active device is a field-effect transistor.
Claim 8
Dependent Claim
25 words
A circuit for converting a differential current signal to a single-ended signal according to claim 5, wherein said active device is a bipolar junction transistor.
Claim 9
Dependent Claim
40 words
A circuit for converting a differential current signal to a single-ended signal according to claim 5, wherein said active device is selected from the group consisting of a metal-semiconductor field-effect transistor, a heterojunction bipolar junction transistor, and a high-electron-mobility transistor.
Claim 10
Dependent Claim
25 words
A circuit for converting a differential current signal to a single-ended signal according to claim 5, wherein said direct current source comprises a high-impedance circuit.
Claim 11
Dependent Claim
45 words
A circuit for converting a differential current signal to a single-ended signal according to claim 5, wherein said direct current source comprises a resonant circuit having an inductor and a capacitor connected in parallel to said inductor, wherein said resonant circuit has a high impedance.
Claim 12
Dependent Claim
26 words
A circuit for converting a differential current signal to a single-ended signal according to claim 5, wherein said direct current source comprises a quarter-wavelength transmission line.
Claim 13
Dependent Claim
64 words
A circuit for converting a differential current signal to a single-ended signal according to claim 1, further comprising a direct current source having two terminals, wherein the bias potential is applied to one of the two terminals of said direct current source, and the other of the two terminals of said direct current source is connected to the charge-collecting terminal of said active device.
Claim 14
Dependent Claim
24 words
A circuit for converting a differential current signal to a single-ended signal according to claim 12, wherein said active device is a field-effect transistor.
Claim 15
Dependent Claim
25 words
A circuit for converting a differential current signal to a single-ended signal according to claim 12, wherein said active device is a bipolar junction transistor.
Claim 16
Dependent Claim
40 words
A circuit for converting a differential current signal to a single-ended signal according to claim 12, wherein said active device is selected from the group consisting of a metal-semiconductor field-effect transistor, a heterojunction bipolar junction transistor, and a high-electron-mobility transistor.
Claim 17
Dependent Claim
25 words
A circuit for converting a differential current signal to a single-ended signal according to claim 12, wherein said direct current source comprises a high-impedance circuit.
Claim 18
Dependent Claim
45 words
A circuit for converting a differential current signal to a single-ended signal according to claim 12, wherein said direct current source comprises a resonant circuit having an inductor and a capacitor connected in parallel to said inductor, wherein said resonant circuit has a high impedance.
Claim 19
Dependent Claim
26 words
A circuit for converting a differential current signal to a single-ended signal according to claim 12, wherein said direct current source comprises a quarter-wavelength transmission line.
Claim 20
Dependent Claim
118 words
A circuit for converting a differential current signal to a single-ended signal according to claim 1, further comprising a first direct current source having two terminals and a second direct current source having two terminals, wherein the bias potential is applied to one of the two terminals of said first direct current source, and the other of the two terminals of said first direct current source is connected to the control terminal of said active device, and wherein the bias potential is applied to one of the two terminals of said second direct current source, and the other of the two terminals of said second direct current source is connected to the charge-collecting terminal of said active device.
Claim 21
Dependent Claim
24 words
A circuit for converting a differential current signal to a single-ended signal according to claim 19, wherein said active device is a field-effect transistor.
Claim 22
Dependent Claim
25 words
A circuit for converting a differential current signal to a single-ended signal according to claim 19, wherein said active device is a bipolar junction transistor.
Claim 23
Dependent Claim
40 words
A circuit for converting a differential current signal to a single-ended signal according to claim 19, wherein said active device is selected from the group consisting of a metal-semiconductor field-effect transistor, a heterojunction bipolar junction transistor, and a high-electron-mobility transistor.
Claim 24
Dependent Claim
32 words
A circuit for converting a differential current signal to a single-ended signal according to claim 19, wherein at least one among said first and second direct current sources comprises a high-impedance circuit.
Claim 25
Dependent Claim
52 words
A circuit for converting a differential current signal to a single-ended signal according to claim 19, wherein at least one among said first and second direct current sources comprises a resonant circuit having an inductor and a capacitor connected in parallel to said inductor, wherein said resonant circuit has a high impedance.
Claim 26
Dependent Claim
33 words
A circuit for converting a differential current signal to a single-ended signal according to claim 19, wherein at least one among said first and second direct current sources comprises a quarter-wavelength transmission line.
References Cited (Backward Citations)
US3659120A
Cited
US5903177A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-11-21 | 2004-05-22 | 2004-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-11-21 | 2008-05-22 | 2008-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-11-21 | 2012-05-22 | 2012-11-21 | $7700.00 | Window Closed / Lapsed |