US5697092A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Floating fet mixer
Assignee: MACOM Technology Solutions Holdings Inc
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Filing: 1996-07-08
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Granted: 1997-12-09
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Expires: 2016-07-08
Abstract
Abstract A floating FET mixer (1) comprises: a field effect transistor, FET, (2) having a gate (11), a drain terminal (4) and a source terminal (5), an LO port (10) at which an LO signal from a local oscillator is coupled to the gate (11), primary windings (9) of a balun (3) across the drain terminal (4) and the source terminal (5), secondary windings (8) of the balun (3) coupled at its opposite ends to ground and an RF port (7), respectively, a center tap (12) on the primary windings (9), and a series biasing element (20) on the gate (11) biasing the FET (2) near pinch off.
Inventors
- 👤 Jean-Marc Mourant
- 👤 Holly A. LaFerrara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:51
CPC Classifications
H; H03; H03D; H03D7/00; H03D7/12; H03D7/125
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
109 words
A floating FET mixer comprises: a field effect transistor, FET, having a gate and a drain terminal and a source terminal, an LO port at which an LO signal from a local oscillator is coupled to the gate, primary windings of a balun across the drain terminal and the source terminal, secondary windings of the balun coupled at its opposite ends to ground and an RF port, respectively, a matching balancing capacitor coupled across the RF port and ground at the opposite ends of the secondary windings, a center tap ground on the primary windings, and a series biasing element on the gate biasing the FET near pinch off.
Claim 2
Dependent Claim
109 words
A floating FET mixer comprises: a field effect transistor, FET, having a gate and a drain terminal and a source terminal, an LO port at which an LO signal from a local oscillator is coupled to the gate, primary windings of a balun across the drain terminal and the source terminal, secondary windings of the balun coupled at its opposite ends to ground and an RF port, respectively, a matching balancing capacitor coupled across the RF port and ground at the opposite ends of the secondary windings, a center tap ground on the primary windings, and a series biasing element on the gate biasing the FET near pinch off.
Claim 3
Dependent Claim
22 words
A floating FET mixer as recited in claim 1, and further comprising: a balancing capacitor coupled across the drain and source electrodes.
Claim 4
Dependent Claim
26 words
A floating FET mixer as recited in claim 1, and further comprising: a diplexer coupled between the midpoint of the primary windings and the center tap.
Claim 5
Dependent Claim
44 words
A floating FET mixer as recited in claim 1, and further comprising: a diplexer coupled between the midpoint of the primary windings and the center tap, an inductor of the diplexer being coupled with the primary windings, and an IF port at the inductor.
Claim 6
Dependent Claim
28 words
A floating FET mixer as recited in claim 1, and further comprising: a transceiver circuit having transmitter circuitry and receiver circuitry connected by a switch to the FET.
Claim 7
Dependent Claim
30 words
A floating FET mixer as recited in claim 1, and further comprising: a low noise amplifier coupled between the RF port and the FET, the FET being in receiver circuitry.
Claim 8
Dependent Claim
35 words
A floating FET mixer as recited in claim 1, and further comprising: the FET being in transmitter circuitry wherein, the FET is coupled to an output amplifier and the RF port and the LO port.
Claim 9
Dependent Claim
40 words
A floating FET mixer as recited in claim 1 wherein, primary windings and secondary windings of the balun are in the form of thin film, planar metal spirals that are interleaved with one another in a side by side arrangement.
Claim 10
Dependent Claim
53 words
A floating FET mixer as recited in claim 1 wherein, primary windings and secondary windings of the balun are in the form of thin film, planar metal spirals that are interleaved with one another in a side by side arrangement, and a balancing capacitor across the primary windings is encircled by the spirals.
Claim 11
Dependent Claim
99 words
A floating FET mixer comprises: a field effect transistor, FET, having a gate and a drain terminal and a source terminal, an LO port at which an LO signal from a local oscillator is coupled to the gate, a switch connecting the LO port with the gate, primary windings of a balun across the drain terminal and the source terminal, secondary windings of the balun coupled at its opposite ends to ground and an RF port, respectively, a center tap ground on the primary windings, and a series biasing element on the gate biasing the FET near pinch off.
Claim 12
Dependent Claim
99 words
A floating FET mixer comprises: a field effect transistor, FET, having a gate and a drain terminal and a source terminal, an LO port at which an LO signal from a local oscillator is coupled to the gate, a switch connecting the LO port with the gate, primary windings of a balun across the drain terminal and the source terminal, secondary windings of the balun coupled at its opposite ends to ground and an RF port, respectively, a center tap ground on the primary windings, and a series biasing element on the gate biasing the FET near pinch off.
Claim 13
Dependent Claim
113 words
A floating FET mixer comprises: a field effect transistor, FET, having a gate and a drain terminal and a source terminal, an LO port at which an LO signal from a local oscillator is coupled to the gate, a switch connecting the LO port with the gate, and receiver circuitry coupled to the FET, and transmitter circuitry coupled to the FET, primary windings of a balun across the drain terminal and the source terminal, secondary windings of the balun coupled at its opposite ends to ground and an RF port, respectively, a center tap ground on the primary windings, and a series biasing element on the gate biasing the FET near pinch off.
Claim 14
Dependent Claim
113 words
A floating FET mixer comprises: a field effect transistor, FET, having a gate and a drain terminal and a source terminal, an LO port at which an LO signal from a local oscillator is coupled to the gate, a switch connecting the LO port with the gate, and receiver circuitry coupled to the FET, and transmitter circuitry coupled to the FET, primary windings of a balun across the drain terminal and the source terminal, secondary windings of the balun coupled at its opposite ends to ground and an RF port, respectively, a center tap ground on the primary windings, and a series biasing element on the gate biasing the FET near pinch off.
References Cited (Backward Citations)
US3769604A
Cited
US4215280A
Cited
US4317230A
Cited
US4705967A
Cited
US4947062A
Cited
US4924115A
Cited
US5513390A
Cited
US5265266A
Cited
US5168180A
Cited
US5420558A
Cited
US5325000A
Cited
US5548239A
Cited
US5517688A
Cited
US5551076A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-12-08 | 2001-06-09 | 2001-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-12-08 | 2005-06-09 | 2005-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-12-08 | 2009-06-09 | 2009-12-09 | $7700.00 | Window Closed / Lapsed |