Passive harmonic switch mixer

Details Passive harmonic switch mixer Passive harmonic switch mixer

2006-02-14

2006-02-14

Vuong, Quochien B. (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S333000, C455S118000, C327S116000, C327S119000

Reexamination Certificate

active

06999747

ABSTRACT:
A passive harmonic switch mixer is shown that is immune to self mixing of the local oscillator greatly reducing leakage noise, pulling noise, and flicker noise when used in a direct conversion receiver or direct conversion transmitter circuit. The passive harmonic switch mixermixes an input signal received on an input port with an in-phase oscillator signal and a quadrature-phase oscillator signal and outputs an output signal on an output port. Because the quadrature-phase oscillator signal is the in-phase oscillator signal phase shifted by 90 °, the passive harmonic switch mixer operates with a local oscillator running at half the frequency of the carrier frequency of an RF signal. Additionally, because the passive harmonic switch mixer has no active components, the DC current passing through each switch device is reduced and the associated flicker noise of the mixer is also greatly reduced.

REFERENCES:
patent: 5589791 (1996-12-01), Gilbert
patent: 5826182 (1998-10-01), Gilbert
patent: 6029059 (2000-02-01), Bojer
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patent: 6892062 (2005-05-01), Lee et al.
patent: 6937849 (2005-08-01), Kluge et al.
patent: 2004/0002315 (2004-01-01), Liu

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