Telecommunications – Transmitter – Amplitude modulation
Patent
1984-03-13
1986-06-03
Ng, Jin F.
Telecommunications
Transmitter
Amplitude modulation
455118, 455183, 455185, 455323, 455330, 455332, H04B 116, H04B 126
Patent
active
045934118
ABSTRACT:
A diode mixer arrangement including a mixer stage connected for receiving a signal having a frequency to be converted and an oscillator signal having one of a plurality of preselectable oscillator frequencies. The mixer stage includes diodes arranged to be biased by a predetermined direct control voltage for the compensation of parasitic influences. A voltage branch is connected to the mixer stage for producing the predetermined direct control voltage. The voltage branch includes a memory device for storing a plurality of data signals each of which represents a predetermined direct control voltage corresponding to a respective one of the plurality of preselectable oscillator frequencies. The memory device has an input for receiving an input signal which represents the preselectable oscillator frequency of the oscillator signal received by the mixer stage and an output for reading out the corresponding data signal which is used by the voltage branch to generate the predetermined direct control voltage.
REFERENCES:
patent: 2425454 (1947-08-01), Bloch
patent: 3855533 (1974-12-01), Schueli
patent: 3868601 (1975-02-01), MacAfee
patent: 4293825 (1981-10-01), Cerra
patent: 4346479 (1982-08-01), Weber
Microwave Magazine, vol. 8, No. 6, Dec. 82, Bert C. Henderson; pp. 718-725.
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