A new integrable composite circuit with improved FET-like characteristics
A new composite circuit comprising five active devices (a JFET and four bipolar transistors) and three passive resistors is described and shown to exhibit FET-like characteristics with much improvement in thermal stability and transfer curve linearity over a wide range of input bipolar voltage. The input resistance of the proposed circuit is, however, equal to that of the FET with the additional advantage that it continues to be high even for positive input voltage. The proposed structure is fully compatible with silicon integrated circuit (IC) technology and may thus be commercially mass-produced as a three-terminal device with its terminals designated as gate, drain, and source.
A New Composite Unit Device Using J-Fet and Bipolar Transistor
A new composite unit device, comprising a J-FET, a bipolar transistor and three passive resistors, is proposed. The new unit offers a linear transfer characteristic over a wide range of input voltage alongwith high input resistance. The proposed circuit is fully compatible with silicon integrated circuit (IC) technology and may thus be fabricated as a three-terminal single unit device.
Simple, Stable and Reliable Transistorized DC Amplifiers
A transistor dc feedback voltage amplifier using a differential input stage followed by a single common emitter stage is analyzed to obtain the gain and drift rate dependence on temperature. It is found that under typical restraints on allowable input terminal current, the open loop gain of such an amplifier is restricted to a value only somewhat greater than twenty (q/2kT) times the voltage across the collector load of the common emitter stage. The drift rate is found to depend on the common emitter stage transistor and on the signal source resistance as well as on the differential stage. A conservative design philosophy which limits each of the factors contributing to drift rate is found to be necessary if predictable, parameter independent performance is to be obtained.