Title:
SUPERPOSED OPERATION CIRCUIT AND FLOATING-VOLTAGE DIGITAL-TO-ANALOG CONVERSION CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2018/205832
Kind Code:
A1
Abstract:
Provided are a superposed operation circuit and a floating-voltage digital-to-analog conversion circuit, so as to implement superposition of analog quantities by using a principle of superposition of indirect currents. A voltage follower is implemented by using a first operational amplifier, so that an output end of the voltage follower is clamped to a voltage inputted by a positive-phase input end, that are, analog quantities to be superposed. Then, a current generation circuit converts a voltage signal into a current signal, the current signal generates a voltage drop on a first resistor connected to an output end of the first operational amplifier, and the voltage drop is superposed with a voltage signal outputted by the first operational amplifier. An output working point of the first operational amplifier in the superposed operation circuit is always fixed to the analog quantities to be superposed, thereby ensuring the output precision of the operational amplifier. In addition, a high-precision current superposed quantity is obtained by converting a low-absolute-precision voltage signal, instead of being directly generated by a digital-to-analog conversion circuit, thereby reducing the requirements on the input precision of the current generation circuit and further reducing the requirements of the current generation circuit on power consumption and an area.
Inventors:
CHEN YUE (CN)
CHEN LIANG (CN)
WANG JIAKE (CN)
CHEN LIANG (CN)
WANG JIAKE (CN)
Application Number:
PCT/CN2018/084320
Publication Date:
November 15, 2018
Filing Date:
April 25, 2018
Export Citation:
Assignee:
HUAWEI TECH CO LTD (CN)
International Classes:
H03K19/20
Foreign References:
| CN107425845A | 2017-12-01 | |||
| CN102541149A | 2012-07-04 | |||
| CN201622488U | 2010-11-03 | |||
| CN104714456A | 2015-06-17 | |||
| CN205352566U | 2016-06-29 | |||
| CN201294673Y | 2009-08-19 | |||
| US20120025064A1 | 2012-02-02 | |||
| CN201710317131A | 2017-05-08 |
Other References:
See also references of EP 3584935A4
Attorney, Agent or Firm:
SHENPAT INTELLECTUAL PROPERTY AGENCY (CN)
Download PDF: