From: sleeper75se (sleeper75se_at_yahoo.se)
Date: 2002-01-11 13:26:50
Hi Jim and Joerg,
I've uploaded version 1.2 of the input stage.
Some tweaks, going from input to output:
*FET-diodes are gone, resistors increased to 5.6Kohms.
*4.7uF caps in the HP-stages are replaced with 1uF, non electrolytics.
*Added an output at U3B pin 7 (integrator output)
*1nF is changed to 470pF in second gain stage. Bandwith should be
12KHz.
*Outputs were added around the 1K resistor in the second gain stage,
so that one may replace it with a potentiometer.
Changes in the power filter:
The resistors directly following the inductors are reduced to 10 ohms
again and 100uF capacitors are added. This RLC-combination forms a
low-Q filter with a cutoff frequency around 150Hz.
Since I want to allow low-voltage operation, the filters are now in
two branches rather than a bus. The resistors have changed to 75
ohms, so the voltage is now 2.3V at Va when the battery voltage 2.6V.
Does everything look ok now? I'd really like to start the layout...
/Andreas
This archive was generated by hypermail 2.1.4 : 2002-07-27 12:28:36 BST