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dvb projekt diyAudio Member Registered: February 2009 Location: Willich, Germany Posts: 1,481 |
Description:
Because the Grounded-Gate Buffer is connected between the DAC output and the passive I/V resistor, normally the I/V resistor is connected between the DAC output and GND, you must get rid off the approx. 4V DC on each I/V resistor. Therefore we must get a new reference GND for each channel. The circuit is connected to the ref.+5V at the output of the buffer and GND, with a decoupling cap for each channel. By trimming each voltage so it exactly matches DC voltage on the I/V resistor, the DC voltage between I/V resistor and reference becomes zero. In other words, the DC component is removed without using a coupling cap. |
Date: Mon August 22, 2011 |
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