Amplifiers – With semiconductor amplifying device – Including frequency-responsive means in the signal...
Patent
1996-03-29
1997-09-30
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including frequency-responsive means in the signal...
330252, 330303, 330306, 327555, 455 93, 455120, 455266, H03F 3191, H04B 102
Patent
active
056730039
ABSTRACT:
An amplifier circuit (204) having a variable bandwidth comprises an amplifier (300), a capacitive element (304), a first npn transistor (302), and a switch control circuit (306). The first npn transistor (302) has a base coupled to an output terminal (205) of the amplifier (300), a collector coupled to a first reference voltage (113), and an emitter coupled to the capacitive element (304) and the switch control circuit (306). When the first npn transistor (302) is switched off by the switch control circuit (306), a first cutoff frequency is determined by a maximum operating frequency of the amplifier (300). When the first npn transistor (302) is switched on by the switch control circuit (306), a second cutoff frequency is determined by a capacitance of the capacitive element (304). For high frequency operation, the amplifier (300) includes at least a second npn transistor for amplification and the first cutoff frequency is determined by a Miller capacitance of the amplifier circuit (204).
REFERENCES:
patent: 4288754 (1981-09-01), Okada et al.
patent: 4306198 (1981-12-01), Okada
patent: 4713627 (1987-12-01), Addis
patent: 4724407 (1988-02-01), Miura et al.
patent: 4748422 (1988-05-01), Matsumoto et al.
patent: 4888502 (1989-12-01), Jarrett
patent: 5266852 (1993-11-01), Shingenari et al.
patent: 5293087 (1994-03-01), Hamano et al.
patent: 5311143 (1994-05-01), Soliday
patent: 5604927 (1997-02-01), Moore
Motorola Inc.
Mullins James B.
Oskorep John J.
LandOfFree
Amplifier circuit having a variable bandwidth does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Amplifier circuit having a variable bandwidth, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Amplifier circuit having a variable bandwidth will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2259892