BIASING OF AN IONIC CURRENT SENSOR
First Claim
1. An ionic current sensor array, comprising:
- a master bias generator configured to generate a bias voltage; and
a plurality of sensing cells, wherein each sensing cell of the plurality of sensing cells includes;
an ionic current sensor;
an integrating capacitor;
a sense transistor coupled between the integrating capacitor and the ionic current sensor; and
an amplifier coupled to provide a reference voltage to bias the ionic current sensor, wherein the amplifier comprises;
a first transistor coupled to receive the bias voltage; and
a second transistor coupled to the first transistor to provide the reference voltage to the ionic current sensor and coupled between a source of the sense transistor and the gate of the sense transistor.
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Abstract
An ionic current sensor array includes a master bias generator and a plurality of sensing cells. The master bias generator is configured to generate a bias voltage. Each sensing cell includes an ionic current sensor, an integrating capacitor, a sense transistor coupled between the integrating capacitor and the ionic current sensor, and an amplifier coupled to provide a reference voltage to bias the ionic current sensor. The amplifier includes a first transistor and a second transistor. The first transistor is coupled to receive the bias voltage, and the second transistor is coupled to the first transistor to provide the reference voltage to the ionic current sensor. The second transistor is also coupled between a source of the sense transistor and the gate of the sense transistor.
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Citations
20 Claims
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1. An ionic current sensor array, comprising:
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a master bias generator configured to generate a bias voltage; and a plurality of sensing cells, wherein each sensing cell of the plurality of sensing cells includes; an ionic current sensor; an integrating capacitor; a sense transistor coupled between the integrating capacitor and the ionic current sensor; and an amplifier coupled to provide a reference voltage to bias the ionic current sensor, wherein the amplifier comprises; a first transistor coupled to receive the bias voltage; and a second transistor coupled to the first transistor to provide the reference voltage to the ionic current sensor and coupled between a source of the sense transistor and the gate of the sense transistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A sensing cell, comprising:
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an ionic current sensor; an integrating capacitor; a sense transistor coupled between the integrating capacitor and the ionic current sensor; and an amplifier coupled to provide a reference voltage to bias the ionic current sensor, wherein the amplifier comprises; a first transistor coupled to receive a bias voltage; and a second transistor coupled to the first transistor to provide the reference voltage to the ionic current sensor and coupled between a source of the sense transistor and the gate of the sense transistor. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A complementary metal-oxide-semiconductor (CMOS) ionic current sensor array, comprising:
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a master bias generator configured to generate a bias voltage in response to a master reference voltage; and a plurality of sensing cells, wherein each sensing cell of the plurality of sensing cells includes; a bias voltage node coupled to the master bias generator; an ionic current sensor; an integrating capacitor; a sense field effect transistor (FET) having a drain coupled to integrating capacitor and a source coupled to the ionic current sensor; and an amplifier coupled to provide a reference voltage to bias the ionic current sensor, wherein the amplifier comprises; a first FET coupled to the bias voltage node to receive the bias voltage; and a second FET coupled to the first FET to provide the reference voltage to the ionic current sensor, wherein the second FET comprises a drain coupled to a gate of the sense FET, a source coupled to a common reference, and a gate coupled to the source of the sense FET, wherein the reference voltage is substantially equal to the master reference voltage.
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Specification