Switched-gain cascode amplifier using loading network for gain c

Details Switched-gain cascode amplifier using loading network for gain c Switched-gain cascode amplifier using loading network for gain c

1997-11-07

2000-04-04

Mottola, Steven J.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330311, H03F 122

Patent

active

060466405

ABSTRACT:
A switched-gain cascode amplifier changes gain by using a differential pair of cascode transistors to switch signal current to one of two different input terminals of a loading network. The load is connected to the loading network which attenuates the output signal by a different amount depending on which input terminal the signal is switched to. In a preferred embodiment, the cascode transistors are driven differentially to conserve power supply headroom, and the bondwire and leadframe inductance of an integrated circuit are utilized as elements of the loading network. The loading network can be extended to include several stages that are implemented as a ladder such as an R/2R ladder with multiple cascode transistors to provide uniform multiple gain steps.

REFERENCES:
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Hayward, Wes; Introduction to Radio Frequency Design, pp. 249-252 (1994).
Fenk, Josef; "RF-Heterodyn Receiver Design Technique for Wireless Systems"; Electronics Laboratories Advanced Engineering Course on RF IC Design for Wireless Communication Systems, Lausanne, Switzerland, Jul. 3-7, 1995 pp. 1, 2 and 28.
Meyer, Robert G.; "A 1-Ghz BiCMOS RF Front-End IC"; IEEE Journal of Solid State Circuits; vol. 29, No. 350-355 (Mar. 1994).
Marshall, Chris, et al.; "A 2.7V GSM Transceiver ICs with On-Chip Filtering"; IEEE International Solid-State Circuits Conference; Paper TA 8.7, pp. 148, 149 and 354 (1995).
Gray, Paul, et al.; Analysis and Design of Analog Integrated Circuits; pp. 225-227 (1977).

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