Analog Integrated-Circuit Blocks

A novel bipolar-drive circuit for medical applications

“…In order to obtain a high output resistance for B and C a modified version of a circuit technique first introduced by Baxandall and Swallow (1966) is employed. Unit D (figure 3) is a transconductance amplifier of conventional design (Greeneich 1996) but, additionally, has mosfet voltage-follower input stages to provide a very high dc input resistance.…”

“…The pnp transistors connected to the sources of the two buffered connected mosfets provide an extra current gain, increasing the g m of the mosfets. The transfer characteristic of a transconductance amplifier (Greeneich 1996) is…”

A translinear-based true RMS-to-DC converter using only npn BJTs

“…The external bias currents I B1 , I B2 and I B3 of this circuit are arranged such that I C2 +I C3 =I B1 , I C4 = I B2 and I C5 + I SQ = I B3 . By applying the translinear principle to the loop formed by the transistors Q 1 , Q 2 , Q 4 and Q 5 , if we assume that the common emitter current gain of all the transistors is much greater than unity, we obtain [10][11][12][13] …”