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 JFET Circuit for Instrumentation Applications
A new class of junction field-effect transistor (JFET) circuit is introduced, which can serve as a simple versatile building block in instrumentation applications. Economical realizations of current-to-voltage converters, voltage-controlled voltage sources, and voltage-controlled current sources are described. The basic circuit building block, called the piggy-back pair, consists of a matched pair of JFET's and two resistors. The basic configuration is easily manipulated to realize various circuit functions when combined with a few other components. It is shown that by full utilization of the terminal properties of JFET's, many simple high-performance circuits can be designed, which have circuit functions determined essentially by resistor ratios and which accordingly are relatively insensitive to device parameters. The circuit design procedure is very straightforward with design limitations clearly indicated. The flexibility and versatility of the piggy-back pair is indicated by the wide range of circuits demonstrated.
F.E.T.-circuit realisation of the inductance
An f.e.t. circuit suitable for realising the inductance is proposed. The circuit is obtained by connecting a source-follower configuration in series with a resistive network utilising one negative resistance. An experimental inductance circuit using three f.e.t.s of the same type is described.