Title :
A programmable gain amplifier buffer design for video applications
Author :
Xu, Gonggui ; Bilhan, Haydar
Author_Institution :
Texas Instruments Inc., Dallas, TX, USA
Abstract :
A programmable gain amplifier (PGA) for video decoder application is presented: 16 linear gain steps from 1.35 to 5.4, 2.5 Vpp output swing, better than -55 dB THD (1 MHz, 2.5 Vpp) for 10 pF loading and 3 V power supply. The programmability is implemented by switching on/off resistors through a low distortion switching scheme. In this scheme, as the switches are symmetrically positioned at amplifier virtual ground, not only low distortion but also gain independent offset are achieved.
Keywords :
buffer circuits; decoding; operational amplifiers; programmable circuits; switching circuits; video coding; 10 pF; 3 V; THD; amplifier virtual ground; buffer design; gain independent offset; linear gain steps; low distortion switching; programmable gain amplifier; resistor on-off switching; video decoder; Circuits; Clamps; Decoding; Electronics packaging; Gain; Instruments; Power supplies; Resistors; Transconductance; Voltage;
Conference_Titel :
Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on
Print_ISBN :
0-7803-8251-X
DOI :
10.1109/ISCAS.2004.1328255
