Title:
PRE-AMPLIFICATION CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2021/077463
Kind Code:
A1
Abstract:
The present invention provides a pre-amplification circuit, comprising a first amplifier and a second amplifier serially connected in sequence, the output terminal of the second amplifier being connected to a circuit output terminal, and the input terminal of the first amplifier being connected to a circuit input terminal; the pre-amplification circuit also comprises a positive feedback branch, the positive feedback branch comprises a diode set and a third amplifier, one end of the diode group is connected to the input terminal of the first amplifier, the input terminal of the third amplifier is connected between the first amplifier and the second amplifier, and the output terminal of the third amplifier is connected to the other terminal of the diode set; the diode set comprises two anti-parallel first diodes and second diodes. The positive feedback branch can positively feed back part of the signal to the other terminal of the diode set, thus reducing the voltage drop across the diode set, and further reducing the harmonic distortion caused by the nonlinearity of the diode set, thereby improving the quality of the sound detected by the microphone transducer.
Inventors:
CHEN QIHUI (CN)
Application Number:
PCT/CN2019/115279
Publication Date:
April 29, 2021
Filing Date:
November 04, 2019
Export Citation:
Assignee:
SUZHOU NOVOSENSE MICROELECTRONICS CO LTD (CN)
International Classes:
H03F1/32; H03F3/183; H03F1/38; H03F3/68
Foreign References:
| US20170359036A1 | 2017-12-14 | |||
| CN103888087A | 2014-06-25 | |||
| US10070222B1 | 2018-09-04 |
Attorney, Agent or Firm:
SUZHOU WISPRO INTELLECTUAL PROPERTY AGENCY (CN)
Download PDF:
Previous Patent: HOLDER ADJUSTMENT DEVICE FOR HANDHELD GIMBAL STABILIZER, AND HANDHELD GIMBAL STABILIZER
Next Patent: WATERPROOF MOTOR
Next Patent: WATERPROOF MOTOR