Switching of resistor epi biasing for reversed resistor connection in offset element cancellation system
AssigneesPanasonic Corporation, Panasonic Semiconductor Asia Pte., Ltd.
InventorsAdrian Yu Chien HOI, Sharon May Yen KHOO, Zhan Quan QUEK, Tech Heng LIM, Jerry Galanga ADVINCULA
Life of this patent
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Abstract
A method of improving voltage detection accuracy and precision by employing a switchable resistor epi bias design, which consists of switches to control connection of resistor epi bias. By constantly maintaining the resistor epi bias to its own resistor terminal bias via switches, higher accuracy detection than conventional resistor bias method can be achieved.
Claims27
A switching voltage divider circuit, comprising:
- two input terminals;
- two resistor divider networks connected to each side of the input terminals;
- and
- two output terminals that are fed to the next sampling circuit stage for further computation and processing.
A method for averaging two input voltages using a switched voltage divider circuit, the method comprising:
- inputting a first input voltage to a first resistor divider network of a switched voltage divider circuit, hence being a first target to be averaged;
- inputting a second input voltage to a second resistor divider network of the said switched voltage divider circuit, hence being a second target to be averaged;
- controlling the switches in said first and second resistor divider networks so that a first group of switches are open simultaneously, while a second group of switches are closed simultaneously;
- taking the difference between the first resistor-averaged signal output from said first resistor divider network, and the second resistor-averaged signal from said second resistor divider network, hence outputting this difference to the next stage.
A method for switching the diffusion contacts of diffusion-type resistors, the method comprising:
- incorporating two switches, their first terminals connected to each side of the resistors' terminals, and the second terminals connected to the contact of the diffusion immediately adjacent to the diffusion in which said resistors' terminals are connected to;
- turning on the first of said switches during a first period by a first control signal, while the second of said switches is turned off;
- and
- turning on the second of said switches in the second period by the second control signal, while the first of said switches is turned off.
A switching voltage divider circuit, comprising:
- a first resistor divider network and a second resistor divider network, each resistor divider network comprising:
- an input terminal;
- a ground terminal;
- an output terminal;
- a first diffusion type resistor and a second diffusion type resistor connected in series with said output terminal being connected to a junction between said first and second diffusion type resistors;
- a first switching assembly operative to connect said input terminal, said first diffusion type resistor, said second diffusion type resistor and said ground terminal serially in said order;
- a second switching assembly operative to connect said ground terminal, said first diffusion type resistor, second diffusion type resistor and said input terminal serially in said order;
- a first control switch arrangement operative to connect the first diffusion type resistor in a reverse bias direction;
- and
- a second control switch arrangement operative to connect the second diffusion type resistor in a reverse bias direction,
- whereby a voltage produced between the output terminals of the first and second resistor divider networks is accurately relative to a voltage applied between the input terminals of the first and second resistor divider networks.
Dependencies are inferred from the claim text.