Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Reexamination Certificate
2005-09-06
2005-09-06
Choe, Henry (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
C330S267000
Reexamination Certificate
active
06940353
ABSTRACT:
A CMOS amplifier includes a CMOS inverter and a bias circuit coupled in a feedback loop between the output and input of the inverter. The bias circuit provides linear biasing so that the inverter can apply a desired gain to a high frequency input signal. The bias circuit can include an operational amplifier (op-amp) providing positive feedback control between the output and input of the inverter. By providing a reference voltage to the other input of the op-amp, the input of the inverter is regulated such that its output is driven to the reference voltage. This in turn forces the inverter to operate in its linear region, so that the inverter applies non-distorting amplification to the input AC signal. The AC signal is prevented from affecting the operation of the bias circuit by resistors coupling the bias circuit to the op-amp.
REFERENCES:
patent: 4241313 (1980-12-01), Takehara
patent: 4352073 (1982-09-01), Leuthold
patent: 4943784 (1990-07-01), Rybicki
patent: 5777516 (1998-07-01), Koifman et al.
patent: 6433637 (2002-08-01), Sauer
patent: 6836186 (2004-12-01), Lee et al.
Bever Hoffman & Harms LLP
Choe Henry
Kubodera John M.
Micrel Incorporated
LandOfFree
High frequency power amplifier does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High frequency power amplifier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High frequency power amplifier will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3366610