Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Patent
1992-10-30
1995-03-07
Urban, Edward F.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
455319, 327113, 327119, H04B 128
Patent
active
053966597
ABSTRACT:
A frequency multiplier and mixer circuit comprises a frequency multiplier circuit composed of a first differential amplifier, which includes a first differential circuit formed of source-coupled first and second FETs having their sources connected in common to a first constant current source and a second differential circuit formed of source-coupled third and fourth FETs having their sources connected in common to a second constant current source. The first and second differential circuits constitute two identical unbalanced source-coupled pairs having the same gate width/length ratio K, input terminals of the pairs being connected in cross-coupled fashion, the output terminals of the pairs being connected in parallel. Gates of the first and third FETs are connected in common to one terminal of a first pair of input terminals for receiving a signal to be frequency-multiplied, and gates of the second and fourth FETs are connected in common to the other terminal of the first pair of input terminals. A current mirror circuit network has an input current path connected to the first output node so as to flow a differential current between the first and second output nodes. A second differential amplifier, which constitutes a mixing circuit, includes a pair of emitter-coupled bipolar transistors having their bases connected to receive a mixing signal. Emitters of the pair of bipolar transistors are connected in common to a mirror current path of the current mirror circuit network. A collector of one of the bipolar transistors gives an output signal.
REFERENCES:
patent: 4912520 (1990-03-01), Yamamoto et al.
patent: 5166645 (1992-11-01), Watts
patent: 5276368 (1994-01-01), Kimura
A. Nedungadi et al., "Design of Linear CMOS Transconductance Elements", IEEE Trans. Circuits and Systems, vol. CAS-31, No. 10, Oct. 1984.
NEC Corporation
Sobutka Philip J.
Urban Edward F.
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