Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1992-10-16
1994-04-05
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330 69, H03F 345
Patent
active
053008960
ABSTRACT:
An ac-coupled differential amplifier having a high common mode rejection ratio (CMRR) and input impedance is disclosed. The ac-coupled amplifier includes a bootstrapped input stage and first and second operational amplifiers, each having a first input, a second input, and an output. The bootstrapped input-stage has a pair of RC high-pass filters, each of which is comprised of a capacitor connected to the first input of each of the operational amplifiers and a pair of resistors connected in series between ground and the first input of each of the operational amplifiers. A pair of bootstrap capacitors connect between each of the series connected resistor pairs of each of the two RC high-pass filters and the second input of each of the operational amplifiers.
REFERENCES:
patent: 4047122 (1977-09-01), Rao
patent: 4242741 (1980-12-01), Parrish
patent: 4320351 (1982-03-01), Brown
patent: 4679002 (1987-07-01), Sherwin et al.
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