Bias Current Generators with Wide Dynamic Range

kevinwjs

Mixed-signal or analog chips often require a wide range of biasing currents that are independent
of process and supply voltage and that are proportional to absolute temperature. This paper describes CMOS
circuits that we use to generate a set of fixed bias currents typically spanning six decades at room temperature
down to a few times the transistor off-current. A bootstrapped current reference with a new startup and power-
control mechanism generates a master current, which is successively divided by a current splitter to generate the
desired reference currents. These references are nondestructively copied to form the chip’s biases. Measurements
of behavior, including temperature effects from 1.6 and 0.35 µ implementations, are presented and nonidealities are
investigated. Temperature dependence of the transistor off-current is investigated because it determines the lower
limit for generated currents. Readers are directed to a design kit that allows easy generation of the complete layout
for a bias generator with a set of desired currents for scalable MOSIS CMOS processes.

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回复 1# kevinwjs


    good thx !!!!!!!!

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