Amplifier and method of canceling distortion by combining hyperbolic tangent and hyperbolic sine transfer functions
US5942939A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 1, 1998 |
| Grant date | Aug 24, 1999 |
| Priority date | — |
| Expiry date | Jun 1, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/3211
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A differential amplifier (10) receives a differential input signal (V.sub.IN). The input signal is attenuated by a first attenuator (12) and applied to a tan h amplifier (16). The input signal is also attenuated by a second attenuator (14) and applied to a sin h amplifier (18). The input signals to the tan h amplifier and sin h amplifier are independently attenuated. The transfer functions of the tan h amplifier and the sin h amplifier each have a linear region and a non-linear region. The output of the tan h amplifier and the sin h amplifier are summed (26) so that the non-linear region of the tan h amplifier cancels with the non-linear region of the sin h amplifier. The overall transfer function of the differential amplifier is linear over a wide range of input signal amplitudes by the cancellation of the non-linear regions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.