Patent ID: 9729113
Date: 2017-08-08
CPC Classifications: G05F,H03F

Claim:
1. A bias circuit adapted for biasing a to-be-biased transconductance cell such that the to-be-biased trans conductance cell has a constant transconductance, said bias circuit comprising: a converter receiving a voltage signal, and generating, based on the voltage signal, a first current signal, a second current signal and a bias voltage that is for biasing the to-be-biased trans conductance cell, in which where V 0 denotes a magnitude of the voltage signal, I 1 and 12 respectively denote magnitudes of the first and second current signals, Vb denotes a magnitude of the bias voltage, T(•) denotes a voltage to current transfer function associated with the to-be-biased transconductance cell, ΔIin denotes a magnitude of a reference current signal which is predetermined, A denotes a predetermined voltage value, B denotes a predetermined current value, N denotes a predetermined constant greater than zero, R denotes a predetermined resistance value, and K denotes a predetermined constant greater than zero and smaller than one; and a controller coupled to said converter, receiving the first and second current signals from said converter, and generating the voltage signal for said converter based on the first and second current signals so as to make the magnitude of the first current signal equal 1/N times the magnitude of the second current signal.