Amplifiers – Combined with automatic amplifier disabling switch means
Reexamination Certificate
2001-11-07
2003-07-01
Tokar, Michael (Department: 2817)
Amplifiers
Combined with automatic amplifier disabling switch means
C330S149000, C330S151000, C330S191000, C330S251000, C330S254000, C330S302000, C330S300000
Reexamination Certificate
active
06586993
ABSTRACT:
BACKGROUND
1. Field of the Invention
This invention relates generally to the field of analog signal processing. More particularly, an impedance matching low noise amplifier having a bypass switch is provided that is especially well suited for use in a staged amplification system for a mobile communications device.
2. Description of the Related Art
The use of a low noise amplifier in a staged amplification system is known. One such amplification system is a cascading amplification system, commonly used in the receiver chain of mobile communication devices. A typical cascading amplification system utilizes at least two stages of amplification. Significantly, the first stage of amplification of the cascading amplifier critically affects the system noise figure because the noise output after the first stage is amplified by subsequent stages. For this reason, the first stage of a cascading amplification system typically consists of a low noise amplifier (“LNA”), which is characterized by a low noise figure.
SUMMARY
An impedance matching low noise amplifier (“LNA”) having a bypassing switch includes an amplification circuit, a bypass switching network and a match adjustment circuit. The amplification circuit has an amplifier input and an amplifier output, and is configured to receive a radio frequency (RF) input signal at the amplifier input and apply a gain to generate an amplified RF output signal at the amplifier output. The bypass switching network is coupled to a low-gain control signal and is also coupled between the amplifier input and the amplifier output. The bypass switching network is configured to couple the amplifier input to the amplifier output when the low-gain control signal is enabled in order to feed the RF input signal through to the RF output signal. The match adjustment circuit is coupled to the low-gain control signal and the RF input signal, and is configured to couple the RF input signal to an impedance when the low-gain control signal is enabled.
REFERENCES:
patent: 4042887 (1977-08-01), Mead et al.
patent: 5661434 (1997-08-01), Brozovich et al.
patent: 5821811 (1998-10-01), Persson
patent: 6002860 (1999-12-01), Voinigescu et al.
patent: 6020848 (2000-02-01), Wallace et al.
patent: 6118338 (2000-09-01), Frank et al.
patent: 6141561 (2000-10-01), Izumiyama
patent: 6175279 (2001-01-01), Ciccarelli et al.
patent: 6253070 (2001-06-01), Andrews
TUE4A-4, A 1.7mA Low Noise Amplifier with Integrated Bypass Switch for Wireless 0.05-6 GHz Portable Applications, Henrik Morkner, et al., 2001 IEEE Radio Frequency Integrated Circuits Symposium.
III-2, A High Performance Switched-LNA IC for CDMA Handset Receiver Applications, Ray Moroney, et al., 1998 IEEE Radio Frequency Integrated Circuits Symposium.
TUE1-2, A Minature PHEMT Switched-LNA for 800 MHz to 8.0 GHz Handset Applications, Henrik Morkner, et al., 1999 IEEE Radio Frequency Integrated Circuits Symposium.
TUE4A-1, A Wide Dynamic Range Switched-LNA In Sige BICMOS, Toshifumi Nakatani, et al., 2001 IEEE Radio Frequency Integrated Circuits Symposium.
Day Jones
Meyer Charles B.
Nguyen Linh V
Pathiyal Krishna K.
Research In Motion Limited
LandOfFree
Impedance matching low noise amplifier having a bypass switch does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Impedance matching low noise amplifier having a bypass switch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Impedance matching low noise amplifier having a bypass switch will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3092044