Telecommunications – Receiver or analog modulated signal frequency converter – With particular receiver circuit
Reexamination Certificate
2007-08-21
2007-08-21
Maung, Nay (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
With particular receiver circuit
C455S334000, C455S335000, C330S254000, C330S276000
Reexamination Certificate
active
11030882
ABSTRACT:
A multi-stage amplifier assembly configured to receive a terrestrial digital television (“DTV”) input signal including multiple frequency channels. The amplifier assembly optionally includes a PIN diode coupled across differential inputs to a first stage of the multi-stage amplifier assembly. The PIN diode is controlled to attenuate the input when an exceptionally large signal is present in a channel adjacent to a desired channel. The PIN diode, essentially a variable resistor, permits the multi-stage amplifier assembly to maintain dynamic range in such situations for reasonable tradeoffs. The amplifier assembly further optionally includes an out-of-band second stage LNA. The amplifier assembly further optionally includes a multi-band input filter. The multi-band filer insures that the AGC operates on the TV band of interest, thus improving the linearity of the system. The invention can be implemented in CMOS and/or SiGe.
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Copy of International Search Report issued Aug. 28, 2002 for Appln. No. PCT/US01/21022, 6 pages.
Sam, B., “Direct Conversion Receiver for Wide-band CDMA,” Wireless Symposium, pp. 1-5, (Spring 2000).
Brooks Charles
Burns Lawrence M.
Dauphinee Leonard
Broadcom Corporation
Chan Richard
Maung Nay
Sterne Kessler Goldstein & Fox PLLC
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