Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Patent
1986-11-05
1988-02-23
Masinick, Michael A.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
455253, 455326, H04B 128
Patent
active
047275979
ABSTRACT:
Mixer arrangement suitable for use in a television receiver operating in the UHF band is disclosed. The arrangement contains a variable gain amplifier stage including a first field effect transistor whose first principal terminal referred to as drain is biased via a load by a DC supply source and whose control terminal referred to as gate receives a first RF signal at a first frequency which is modulated by a second signal at a second frequency applied to the amplifier stage through a variable resistor T.sub.2 such that the output signal of the amplifier stage which is available at the first principal drain terminal of the first transistor is formed from the mixture of the first and the second signal. The second signal OL is applied via the variable resistor to the first principal drain terminal of the first transistor T.sub.1 resulting in the variation of the amplifier gain occurring from the modulation of the load constituted by the biasing load above and the variable resistor. The second principal terminal referred to as source of the first transistor is directly brought to a reference potential.
REFERENCES:
patent: 4413239 (1983-11-01), Romeo et al.
patent: 4490854 (1984-12-01), Bensussan et al.
patent: 4596959 (1986-06-01), Kawakami
"A Monolithic GaAs IC for Heterodyne Generation of RF Signals" Van Tuyl, IEEE Trans. on Electron Devices, vol. ED 28, #2, Feb. 1981, pp. 166-170.
"A Monolithic GaAs FET RF Signal Generation Chip" Van Tuyl ISSCC, Feb. 1980.
Briody Thomas A.
Gadson Gregory P.
Masinick Michael A.
Streeter William J.
U.S. Philips Corporation
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