The control circuit includes a first section for generating a control current and a pair of current mirror sections that divide the control current, generating a pair of differential control signal components as {HEAD ~ VGS potentials} of {TAIL ~ a pair} of CMOS transistors configured as current mirrors 
The control circuit includes a first section for generating a control current and a pair of current mirror sections that divide the control current , generating a pair of differential control signal components as { HEAD ~ VGS potentials } of { TAIL ~ a pair } of CMOS transistors configured as current mirrors
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