Amplifiers – With semiconductor amplifying device – Including plural amplifier channels
Reexamination Certificate
2007-12-26
2009-12-15
Mottola, Steven J (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including plural amplifier channels
C330S302000
Reexamination Certificate
active
07633345
ABSTRACT:
An amplifier amplifying an input signal and the method thereof. The amplifier comprises an impedance matching network and a transconductor amplifier. The impedance matching network receives the input signal to perform impedance matching thereon, and comprises a first resistor, a first transistor, and a second resistor. The first resistor, receives the input signal to generate a matched signal. The first transistor coupled to the first resistor, has a channel thermal noise to establish a first noise voltage. The second resistor coupled to the first resistor and transistor, receives the channel thermal noise to establish a second noise voltage. The transconductor amplifier coupled to the impedance matching network, comprises first and second transconductor circuits. The first transconductor circuit with first transconductance, coupled to the first resistor and transistor, receives the first noise voltage to generate a first noise current. The second transconductor circuit with second transconductance, coupled in parallel to the first transconductor circuit and in series to the load, receives the second noise voltage to generate a second noise current such that the first and second noise currents cancel each other out to reduce a noise component in the output current to the load when summing up together. The first and second transconductance have the opposite signs.
REFERENCES:
patent: 6472932 (2002-10-01), Morie et al.
Bruccoleri et al., “Wide-Band CMOS Low-Noise Amplifier Exploiting Thermal Noise Canceling” IEEE J. Solid-State Ckts., v. 39, No. 2, Feb. 2004, pp. 275-282.
MediaTek Inc.
Mottola Steven J
Thomas Kayden Horstemeyer & Risley
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