Arrangement for stabilizing the gain bandwidth product

An integrated circuit including a circuit for stabilizing the gain-bandwidth product (gm/C.sub.L) of an associated analog circuit including bipolar devices, the transconductance gm of an included bipolar device being ideally characterized by the relation gm=I.sub.C /V.sub.T, I.sub.C defined as the bipolar collector current and V.sub.T defined as the thermal voltage, and C.sub.L is defined as the load capacitance of said analog circuit, the stabilization circuit comprising:

• a reference current module (14) including a switched capacitance of a predetermined value (C.sub.S), for receiving as separate inputs a pair of voltage potentials (V.sub.1, V.sub.2) such that said predetermined capacitance is switched between said pair of input voltage potentials at a predetermined frequency (f.sub.CLK), said reference current module thereby generating as an output a DC reference current I.sub.REF, I.sub.REF being defined by the relation I.sub.REF =k* f.sub.CLK *(V.sub.1 -V.sub.2)* C.sub.S. where k is a scaling constant;
• and
• a biasing module (24) responsive to said reference current for coupling said reference current between said reference current module and said associated analog circuit such that said reference current is used to generate a bias current for said included bipolar devices, said bias current also being directly proportional to said thermal voltage so as to eliminate the effects of said thermal voltage introduced by said transconductance (gm), wherein
• the gain-bandwidth product gm/C.sub.L of said included bipolar devices is essentially invariant with respect to the load capacitance C.sub.L by the presence of the switched capacitance factor C.sub.S in said bias current such that gm/C.sub.L .alpha.f.sub.CLK.