EP0549296A1
Expired / Lapsed
EP
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R.F. Mixer
Assignee: BAE Systems Electronics Ltd
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Filing: 1992-12-21
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Granted: —
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Expires: 2012-12-21
Abstract
Abstract A mixer of the commutating type using FETs to switch between the primary of a transformer 1 for an r.f. input and the secondary of a transformer 2 for an i.f. output, has high linearity and low power consumption of the local oscillator drive because the gate electrodes of the FETs are switched using pulse waveforms e.g. from driving transistors 6 to 9.
Inventors
- 👤 Ian Francis Cox
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 05:59
CPC Classifications
H; H03; H03D; H03D7/00; H03D7/14; H03D7/1425; H03D7/145; H03D7/1458; H03D7/1466; H03D7/1491; H03B; H03B2200/00; H03B2200/006; H03B2200/0082; H03D2200/00; H03D2200/0041; H03D2200/0084; H03D2200/0088; H03D7/12; H03D7/125
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
65 words
A mixer for frequency changing an r.f. input to produce an output at a different frequency, comprising a pair of insulated gate FET switching devices for connecting the input to the output and a drive circuit for producing pulse waveforms for repetitively charging and discharging the capacitance of the FET gates to switch the FET switching devices on and off at a local oscillator frequency.
Claim 2
Dependent Claim
33 words
A mixer as claimed in claim 1, in which the drive circuit includes a pair of transistors for switching the FET gate between different potentials to switch the respective gates on and off.
Claim 3
Dependent Claim
24 words
A mixer as claimed in claim 2, in which the transistors have gate electrodes connected to a local oscillator drive via a respective capacitor.
Claim 4
Dependent Claim
19 words
A mixer as claimed in claim 2 or claim 3, in which the switching transistors form a complementary pair.
Claim 5
Dependent Claim
18 words
A mixer as claimed in any one of claims 1 to 4, in which the FETs are MOSFETs.
References Cited (Backward Citations)
No citation records indexed.
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