Analog-to-digital converter circuit and method of implementing an analog-to-digital converter circuit
First Claim
1. An analog-to-digital converter circuit comprising:
- an amplifier circuit configured to receive a differential analog input signal at a first amplifier input associated with a first amplifier current path and a second amplifier input associated with a second amplifier current path, and to amplify the differential analog input signal to generate a differential analog output signal at a first amplifier output associated with the first amplifier current path and at a second amplifier output associated with the second amplifier current path, wherein;
the amplifier circuit comprises a first resistive load coupled between a reference voltage and a first transistor of the first amplifier current path;
a first input signal of the differential analog input signal is coupled to a gate of the first transistor;
the amplifier circuit further comprises a second resistive load coupled between the reference voltage and a second transistor of the second amplifier current path; and
a second input signal of the differential analog input signal is coupled to a gate of the second transistor;
a first capacitor coupled between the first amplifier input and the second amplifier output;
a second capacitor coupled between the second amplifier input and the first amplifier output; and
a latch circuit having a first latch input coupled to the first amplifier output and a second latch input coupled to the second amplifier output, wherein the latch circuit is configured to generate a differential digital output signal, based upon the differential analog output signal, at a first latch output and a second latch output.
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Abstract
An analog-to-digital converter circuit is described. The analog-to-digital converter circuit comprises an amplifier circuit configured to receive a differential analog input signal at a first amplifier input associated with a first amplifier current path and a second amplifier input associated with a second amplifier current path, and to generate an amplified differential analog input signal at a first amplifier output associated with the first amplifier current path and a second amplifier output associated with the second amplifier current path; a first capacitor coupled between the first amplifier input and the second amplifier output; a second capacitor coupled between the second amplifier input and the first amplifier output; and a latch circuit having a first latch input coupled to the first amplifier output and a second latch input coupled to the second amplifier output, wherein the latch circuit is configured to generate a differential digital output signal, based upon the amplified differential analog input signal, at a first latch output and a second latch output.
18 Citations
18 Claims
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1. An analog-to-digital converter circuit comprising:
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an amplifier circuit configured to receive a differential analog input signal at a first amplifier input associated with a first amplifier current path and a second amplifier input associated with a second amplifier current path, and to amplify the differential analog input signal to generate a differential analog output signal at a first amplifier output associated with the first amplifier current path and at a second amplifier output associated with the second amplifier current path, wherein; the amplifier circuit comprises a first resistive load coupled between a reference voltage and a first transistor of the first amplifier current path; a first input signal of the differential analog input signal is coupled to a gate of the first transistor; the amplifier circuit further comprises a second resistive load coupled between the reference voltage and a second transistor of the second amplifier current path; and a second input signal of the differential analog input signal is coupled to a gate of the second transistor; a first capacitor coupled between the first amplifier input and the second amplifier output; a second capacitor coupled between the second amplifier input and the first amplifier output; and a latch circuit having a first latch input coupled to the first amplifier output and a second latch input coupled to the second amplifier output, wherein the latch circuit is configured to generate a differential digital output signal, based upon the differential analog output signal, at a first latch output and a second latch output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of implementing an analog-to-digital converter circuit comprising:
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receiving a differential analog input signal at a first amplifier input of a first amplifier path of an amplifier circuit and a second amplifier input of a second amplifier path of the amplifier circuit; reducing noise at the first amplifier input and the second amplifier input via a first capacitor coupled between the first amplifier input and a second amplifier output associated with the second amplifier path and via a second capacitor coupled between the second amplifier input and a first amplifier output associated with a first amplifier path; amplifying the differential analog input signal to generate a differential analog output signal at the first amplifier output and the second amplifier output; latching data at a first latch input that is coupled to the first amplifier output and at a second latch input that is coupled to the second amplifier output; and generating a differential digital output signal, based upon the differential analog output signal, at a first latch output and a second latch output;
wherein;a first resistive load is coupled between a reference voltage and a first transistor of the first amplifier current path; a first input signal of the differential analog input signal is coupled to a gate of the first transistor; a second resistive load is coupled between the reference voltage and a second transistor of the second amplifier current path; and a second input signal of the differential analog input signal is coupled to a gate of the second transistor. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification