Telecommunications – Receiver or analog modulated signal frequency converter – With wave collector
Reexamination Certificate
2005-07-07
2009-02-17
Trinh, Sonny (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
With wave collector
C455S302000, C455S313000
Reexamination Certificate
active
07493097
ABSTRACT:
A mixer is disclosed having an output stage with an amplifier or gain device configured in a feedback loop to maintain a virtual ground at the input to the gain device. The gain device provides significant dynamic range, gain, and the appropriate impedance matching to insure a low noise output signal of a desired magnitude. Use of an amplifying output stage removes the dependence between mixer gain and mixer configuration, such as mixer bias resistor value, while concurrently overcome undesirable flicker noise that results from use of active devices in the mixer bias structure. A stable virtual ground at the mixer output and gain device input provides linearity over frequency. The gain device may comprises an operational amplifier or trans-resistance/trans-conductance device.
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Hatcher Geoffrey
Ismail Aly M.
Yates Dave
Youssoufian Edward
Skyworks Solutions Inc.
Trinh Sonny
Weide & Miller Ltd.
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