High frequency differential amplifier
AssigneeJennic Limited
InventorClive Roland Taylor
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Abstract
The present invention relates to a folded differential amplifier having very high output impedance capable of being operated at frequencies of the order of gigahertz.
Claims7
An amplifier comprising an input stage (102) having at least one signal input terminal and a biasing arrangement (P1) arranged to bias the at least one signal input terminal, an output stage (108) comprising a pair of FET transistors (P4;
- P5) arranged such that the gates thereof are biased using a common mode gate bias voltage (VB) derived from a resistive arrangement (R2;
- R3) formed between the output terminals (116, 118) of the pair of FET transistors (P4;
- P5)
An amplifier as claimed in claim 7, in which the current biasing stage (106) comprises at least a matched pair of parallel arranged first (N1) and second (N2) constant current sources in series with at least a pair of parallel arranged first (N3) and second (N4) variable current sources, with the clamping resistor (R1) being coupled between the drains of the first (N1) and second (N2) constant current sources and the sources of first (N3) and second (N4) variable current sources.
Dependencies are inferred from the claim text.