Patent ID: 9163996
Filing Date: 2015-10-20
Classification: G01J,H04N

Abstract:
1. A readout circuit for an uncooled infrared focal plane array, comprising: a first biasing circuit, wherein said first biasing circuit is connected to an active microbolometer unit, said first biasing circuit generates a detection output signal according to an electrical property of said active microbolometer unit; a second biasing circuit, wherein said second biasing circuit comprises a first reference microbolometer unit, said second biasing circuit generates a first reference output signal according to an electrical property of said first reference microbolometer unit; a first integration circuit, wherein said first biasing circuit and said second biasing circuit are connected to said first integration circuit, said first integration circuit subtracts said first reference output signal from said detection output signal and amplifies a difference of said detection output signal and said first reference output signal, for generating an integration output signal; and an analog-to-digital circuit, wherein said first integration circuit is connected to said analog-to-digital circuit, said analog-to-digital circuit converts said integration output signal to a digital output signal; wherein said analog-to-digital circuit comprises a ramp signal generator, wherein said ramp signal generator comprises: a ramp signal generating circuit; and a third biasing circuit, wherein said third biasing circuit is connected to said ramp signal generating circuit; wherein said third biasing circuit comprises a second reference microbolometer, said third biasing circuit generates a second reference output signal according to an electrical property of said second reference microbolometer, and sends said second reference output signal to said ramp signal generating circuit; wherein said ramp signal generating circuit generates a ramp signal according to said second reference output signal.