Power control device wherein a bias voltage in level detection is given a constant difference from a detected voltage
US5383223A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 4, 1993 |
| Grant date | Jan 17, 1995 |
| Priority date | — |
| Expiry date | Jun 4, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W52/52
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In a level detector (17), a bias voltage is developed by a bias current to have a substantially constant difference irrespective of a temperature variation from a detected voltage produced by detecting a device output signal for use in TDM modulation. A control signal generator (19) calculates a substantially temperature independent difference digital value by subtracting a second digital value of the bias voltage from a first digital value of the detected voltage to produce an attenuation control analog level used in controlling a variable attenuator (11) which deals with a device input signal to produce an attenuator output signal with a desired value for use as the device output signal. Preferably, the detected and the bias voltages are amplified by a variable gain amplifier (35) controlled by a processor output signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.