Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Patent
1989-03-02
1991-10-01
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
329344, 455330, H04B 126
Patent
active
050541188
ABSTRACT:
A mixer circuit has a first filter connected between a local oscillator terminal and a node and another filter connected between a RF signal terminal and the node. A first circuit path extends from the node through a first diode to a first tuned circuit which can be connected to an input terminal of a balanced-to-unbalanced converter. A second circuit path extends from the node through an oppositely disposed diode which is connected to another tuned circuit which can be connected to another input terminal of the balanced-to-unbalanced converter. The diodes alternately conduct in response to opposite half cycles of the local oscillator signal and the RF signal to generate a variety of mixing components. The tuned circuits preserve the desired output signal and attenuate the other mixing components.
REFERENCES:
patent: 3493870 (1970-02-01), Kupfer
patent: 4355420 (1982-10-01), Ishihara
patent: 4864644 (1989-09-01), Takahashi et al.
Holcomb Don R.
Zelinka David M.
Eisenzopf Reinhard J.
Handy Robert M.
Jones Maurice J.
Motorola Inc.
Pham Chi H.
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