| 摘要 |
Variable gain amplifiers with controllable gain gradient over temperature. A variable gain amplification circuit comprises an input terminal receiving an input signal, an output terminal outputting an output signal, and a control terminal receiving a first gain control signal. The relationship between gain of the variable gain amplification circuit and temperature is programmable rather than temperature independent, and is controlled by the first gain control signal obtained by a second gain control signal and a third gain control signal. The second gain control controls gain of a variable gain amplification circuit linearly, the third gain control signal controls gain gradient of the variable gain amplification circuit over temperature and the third gain control signal is determined based on a formula of S CT = ∑ n = 1 N ⁢ S n ⁡ [ ( T T 0 ) n - 1 ] , in which T0 represents a predetermined temperature, T represents a present temperature, and Sn represents the nth programmable signal. |
