Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Patent
1997-09-19
2000-02-15
Vo, Nguyen
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
327113, H04B 128
Patent
active
060262877
ABSTRACT:
A converter, transmitter and/or receiver for mixing an input signal (I.sub.RF) having a first frequency (RF) with an input signal (I.sub.LO) coming from a local oscillator having a second frequency (LO), and for producing an output signal (O.sub.IF) having an intermediate frequency (IF), with rejection of the harmonics of the second frequency (LO) up to a very high order, for example, higher than the tenth order. The device includes a double balanced ring mixer (17) of field effect transistors (12, 13, 14, 15), having a first and a second pair of input terminals (3, 4; 1, 2) and having a pair of output terminals (5, 6), and a first and a second coupler (18, 19) respectively acting as a phase separator and phase combiner for the input signal (I.sub.RF) having the first frequency (RF) and output signal (O.sub.IF) having the intermediate frequency (IF), connected to the first pair of input terminals (3, 4) and to the pair of output terminals (5, 6) respectively, of the ring mixer (17), and each formed by a first and second identical passive phase shifter circuit (300, 400; 500, 600) including isolated elements, and arranged symmetrically so that the respective impedances on the terminals of the first input pair and the terminals of the output pair of the mixer are identical.
REFERENCES:
patent: 4947062 (1990-08-01), Weiner et al.
patent: 4979233 (1990-12-01), Kawahata
patent: 5060298 (1991-10-01), Waugh et al.
patent: 5153469 (1992-10-01), Petted et al.
Boyavalle Christophe
Jean Patrick
Puechberty Eric
Biren Steven R.
Fuller Greta J.
U.S. Philips Corporation
Vo Nguyen
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