Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier
Patent
1976-10-28
1977-06-28
Mullins, James B.
Amplifiers
Signal feedback
Combined with control of bias voltage of signal amplifier
330109, H03F 134, H03F 304
Patent
active
040328554
ABSTRACT:
A phonograph preamplifier network with infrasonic cutoff response. The preamplifier network is an active filter configuration with a high gain, high input impedance differential amplifier provided with an RIAA equalization feedback filter network coupled between the amplifier output and inverting input. An RC filter network is coupled between the inverting amplifier input and ground potential to provide a single, low frequency real axis pole. In addition, an input filter feedback network is coupled between the preamplifier input terminal and the non-inverting input of the amplifier, and further bootstrapped to the amplifier inverting input. The network provides a pair of low frequency off-axis complex poles. The RC filter and the input filter feedback networks are adapted to control the infrasonic frequency response of the active filter preamplifier network so that the preamplifier network is characterized by an 18 dB per octave roll-off response at frequencies below a predetermined infrasonic frequency, and a relatively flat response at frequencies in a range adjoining and above that infrasonic frequency.
REFERENCES:
patent: 3621412 (1971-11-01), Keeling et al.
Advent Corporation
Mullins James B.
LandOfFree
Phonograph preamplifier network with infrasonic cutoff response does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Phonograph preamplifier network with infrasonic cutoff response, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Phonograph preamplifier network with infrasonic cutoff response will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1523986