MATEC Web Conf.
Volume 355, 20222021 International Conference on Physics, Computing and Mathematical (ICPCM2021)
|Number of page(s)||10|
|Section||Computing Methods and Computer Application|
|Published online||12 January 2022|
A large gain variable range, high linearity, lownoise, low DC offset VGAs used in BD system
1 Beijing Microelectronics Technology Institute. BeiJing, China
2 Beijing Mxtronics Technology Co.Ltd, Beijing, China
3 Beijing Microelectronics Technology Institute. Bei Jing, China
* Corresponding author: firstname.lastname@example.org
In this paper, a large gain variable range, high linearity, low noise, low DC offset VGAs with a simple gain-dB variable circuit are introduced. In the VGAs chain, the last and the first VGAs employ Bipolar transistors, to improve the linearity and noise characteristics. And the middle three stages VGAs employ MOS transistors. The whole circuitry is designed in 0.35um BiCMOS process, including variable gain amplifiers (VGAs) , fixed gain amplifiers , gain control and DC offset cancellation parts. The automatic gain control loop (AGC) provides a process independent gain variable range of 60dB (including 50dB gain-dB-linearity variable range), with a 200us loop lock time, the VGAs provide a 73dB largest gain, the THD is less than 1% at a 1V(P-P) output level; the equivalent output integral noise is 0.011v/√hz@20MHz bandwidth. The whole area is 1173um*494 um, and the power is 7.1mA at 3.3V signal supply voltage.
Key words: VGA / AGC / RF / ANALOG / SATELLITE NAVIGATION / dB-LINEARITY
© The Authors, published by EDP Sciences, 2022
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