Amplifiers – With semiconductor amplifying device – Including particular biasing arrangement
Reexamination Certificate
2009-04-01
2009-11-03
Choe, Henry K (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including particular biasing arrangement
C330S285000
Reexamination Certificate
active
07612614
ABSTRACT:
Provided is circuitry for biasing a transistor amplifier with a DC-voltage signal, the transistor amplifier having a first input terminal, a second input terminal, and an output terminal coupled to the second input terminal. The circuitry includes a sensor capacitor connected to the first input terminal and an impedance transistor arranged in parallel with said capacitor, the transistor and capacitor forming a low-pass filter. The circuitry also includes a biasing circuit configured to controllably vary a DC-voltage signal for operatively biasing the amplifier, the biasing circuit including a cascaded current arrangement configured to subdivide a reference current into smaller currents for selectively generating voltage potentials for biasing the impedance transistor to adjustably filter a noise component of the DC-voltage signal via the low-pass filter before the DC-voltage signal is provided to the first input terminal.
REFERENCES:
patent: 7009453 (2006-03-01), Kuriyama
patent: 7332968 (2008-02-01), Luo
patent: 7355480 (2008-04-01), Honda
patent: 7358817 (2008-04-01), Kao et al.
patent: 7365604 (2008-04-01), Luo et al.
patent: 1374754 (2002-10-01), None
patent: 7-31149 (1995-01-01), None
patent: 7-244111 (1995-09-01), None
patent: 8-66011 (1996-03-01), None
Fürst, Claus Erdmann. “A Low-Noise/Low-Power Preamplifier for Capacitive Microphones,” IEEE, 1996, pp. 477-480, 0-7803-3073-0/96.
Bernabé Linares-Barranco, On the Design and Characterization of Femtoampere Current-mode Circuits, IEEE Journal of Solid-State Circuits, vol. 38, No. 8, 2003.
Li Cong Ke
Li Ping Wai
Wang Wei
Choe Henry K
Kontel Data System Ltd.
Wang George G.
Wilkinson & Grist
LandOfFree
Device and method for biasing a transistor 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 Device and method for biasing a transistor amplifier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device and method for biasing a transistor amplifier will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4067223