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Norton_ultra_linear_tuzo_decade_VCO

2017-03-06 07:01  
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Norton_ultra_linear_tuzo_decade_VCO
Norton_ultra_linear_tuzo_decade_VCO
In this circuit, a Norton is used to drive a fast PLL to form a VCO (which is essentially a form of V/F converter described in chapter 12). The frequency range is from 50 kHz to 5 MHz. Figure 11-23B shows the linearity error over the frequency range. To calibrate, monitor the output with a frequency counter, apply the voltages shown at VIN, and adjust both the zero and full-scale pots for the correct frequency.