High isolation switch buffer for frequency hopping radios

Details High isolation switch buffer for frequency hopping radios High isolation switch buffer for frequency hopping radios

Filed on

2006-12-05

Date issued

2006-12-05

Examiner

Urban, Edward F. (Department: 2618)

Patent Class

Telecommunications

SubClass

Receiver or analog modulated signal frequency converter

SubSubClass

Frequency modifying or conversion

Other Related Categories

C455S319000, C455S118000, C455S255000, C331S002000, C331S008000, C331S030000

Type

Reexamination Certificate

Status

active

Patent number

07146149

Description

ABSTRACT:
A local oscillator (LO) circuit is disclosed which provides improved isolation between the unselected LO source and a mixer. The LO circuit includes a first LO source to generate a first periodic signal cycling at a first frequency, a second LO source to generate a second periodic signal cycling at a second frequency different than the first frequency, a limiter, a first switching element to selectively couple the first LO source to the limiter, and a second switching element to selectively couple the second LO source to the limiter. The limiter improves the isolation of the leakage LO signal (i.e. the unselected LO signal) with respect to the selected LO signal. The improved isolation comes about because the limiter gain associated with the selected LO signal is greater than the gain associated with the leakage LO signal. A receiver and transmitter using the LO circuit are also disclosed.

REFERENCES:
patent: 4006353 (1977-02-01), Pierce
patent: 5231632 (1993-07-01), Yamao et al.
patent: 5309479 (1994-05-01), Cheah
patent: 5574755 (1996-11-01), Persico
patent: 5898913 (1999-04-01), Pengelly et al.
patent: 5917854 (1999-06-01), Taylor et al.
patent: 5960334 (1999-09-01), Nakano
patent: 6163222 (2000-12-01), Kobayashi
patent: 6211718 (2001-04-01), Souetinov
patent: 6654595 (2003-11-01), Dexter
patent: 6904266 (2005-06-01), Jin et al.
patent: 6952572 (2005-10-01), Wong et al.
patent: 6973188 (2005-12-01), Seitner
patent: 2004/0002320 (2004-01-01), Lin
patent: 2004/0056726 (2004-03-01), Dvorak

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