Accurate active termination device
AssigneeSTMicroelectronics S.r.l.
InventorGiovanni Galli
Life of this patent
Estimating the term…
Abstract
An active precision termination of the type incorporated in a voltage regulator for feeding the lines of an external bus is presented. Each termination includes a matching impedance connected in series to a switch formed by a MOS transistor, including a cell formed by a plurality of circuit branches provided in parallel and coupled to a unique output terminal. Each branch includes an input coupled to the series of the impedance and of the switch and receiving a control voltage signal. The body terminal of each MOS transistor receives a corresponding control signal via an inverter, whereas the control terminal of each MOS transistor receives a corresponding control voltage signal.
Claims13
An active precision termination in an integrated circuit comprising:
- a cell formed by a plurality of circuit branches provided in parallel and coupled to a common output terminal, each circuit branch including an input terminal, an impedance, and an MOS transistor switch coupled to each other, the MOS transistor switch including a gate terminal that receives a first control voltage signal and a bulk terminal that receives a second control voltage signal;
- and
- a generator circuit for generating a plurality of first and second control voltage signals for driving the gate and bulk terminals of the MOS transistor switches of the respective plurality of circuit branches.
An active precision termination of the type incorporated in a voltage regulator interfaced to a bus of an integrated circuit and coupled to lines of the bus, the termination comprising:
- a cell including a plurality of circuit branches provided in parallel and coupled to a common output terminal, each circuit branch comprising a matching impedance and a MOS transistor connected in series to each other, wherein a body terminal of each MOS transistor receives a respective first control voltage signal via a respective inverter coupled to the respective MOS transistor.
An integrated circuit for a precision active termination comprising:
- a set of termination circuits, each termination circuit including a signal amplifier, a MOS transistor having a control and a bulk terminal, and an impedance all coupled in series, the set of termination circuits all coupled to a single output terminal;
- and
- a control voltage generator circuit structured to generate control voltages for driving the control and bulk terminals of the integrated circuit.
Dependencies are inferred from the claim text.