MOS transconductor with broad trimming range
AssigneeSTMicroelectronics S.r.l.
InventorsStefano Marchese, Giacomino Bollati, Maurizio Malfa, Pierandrea Savo
Life of this patent
Estimating the term…
Abstract
A transconductor includes a differential stage formed by a pair of input transistors, and a resistive line of degeneration connecting the sources of the input transistors. A bias current generator is coupled between the source of each input transistor and ground. The resistive line of degeneration is formed by one or more transistors connected in series, the gates of which are coupled to a voltage reference. The voltage reference is at least equal to the common mode voltage of the differential stage. The one or more transistors forming the resistive line of degeneration are sized to operate in the triode region.
Claims28
A transconductor comprising:
- a differential stage comprising
- a pair of input transistors,
- a resistive line of degeneration connected between respective first conduction terminals of said pair of input transistors, said resistive line of degeneration comprising one or more transistors connected in series, a control terminal of each transistor being coupled to a first voltage reference at least equal to a common mode voltage of said differential stage, and said one or more transistors being biased to operate in a triode region, and
- a pair of bias current generators, each bias current generator being coupled between a first conduction terminal of a respective input transistor and a second voltage reference.
A transconductor comprising:
- a differential stage comprising
- a pair of input transistors,
- one or more transistors connected in series between respective first conduction terminals of said pair of input transistors, and operating in a triode region, and
- at Least one bias current generator connected to said pair of input transistors.
A method for operating a transconductor comprising a differential stage comprising a pair of input transistors, the method comprising:
- operating one or more transistors in a triode region and which are connected in series between respective first conduction terminals of the pair of input transistors;
- and
- biasing the pair of input transistors.
Dependencies are inferred from the claim text.