Startup procedure for a passive infrared sensing circuit

    公开(公告)号:US12117346B2

    公开(公告)日:2024-10-15

    申请号:US17738322

    申请日:2022-05-06

    摘要: A control device may comprise a passive infrared sensing circuit configured to operate in a charging state to charge one or more capacitors to appropriate voltages for operation in an operational state of the sensing circuit. The sensing circuit may comprise a pyroelectric detector configured to generate an output signal in response to received infrared energy, and first and second amplifier circuits configured to amplify the output signal. The control device may comprise a control circuit coupled to receive a sensing signal from the second amplifier circuit. Prior to the operational state, a capacitor of the first amplifier circuit may charge through a diode coupled between an output and an inverting input of an operational amplifier. In addition, prior to the operational state, a capacitor of the passive infrared sensing circuit may charge through the control circuit until the magnitude of a voltage across the capacitor exceeds a threshold voltage.

    HIGH-ENERGY SUPPRESSION FOR CAPACITOR TRANSIMPEDANCE AMPLIFIER (CTIA)-BASED IMAGERS OR OTHER IMAGING DEVICES

    公开(公告)号:US20230253932A1

    公开(公告)日:2023-08-10

    申请号:US17649994

    申请日:2022-02-04

    申请人: Raytheon Company

    IPC分类号: H03F3/08 H03F1/08 H03F3/70

    CPC分类号: H03F3/087 H03F1/08 H03F3/70

    摘要: An apparatus includes a photodetector configured to generate an electrical current based on received illumination. The apparatus also includes a capacitor transimpedance amplifier (CTIA) unit cell having (i) an amplifier configured to receive the electrical current and a reference voltage, (ii) a feedback capacitor coupled in parallel across the amplifier, and (iii) a reset switch coupled in parallel across the feedback capacitor. The apparatus further includes an event detector configured to sense a high-energy event affecting the photodetector. In addition, the apparatus includes a switchable clamp coupled across inputs of the amplifier, where the event detector is configured to close the switchable clamp in response to sensing the high-energy event.

    SIGNAL DETECTION DEVICE AND OPTICAL CHARACTERISTICS MEASUREMENT DEVICE

    公开(公告)号:US20180149587A1

    公开(公告)日:2018-05-31

    申请号:US15822398

    申请日:2017-11-27

    摘要: A signal detection device according to one aspect of the present invention includes a receiver configured to receive a signal including at least a first signal component modulated by a first frequency and a second signal component modulated by a second frequency, and a detector configured to generate, using a base signal, a first reference signal to be used for detecting the first signal component and a second reference signal to be used for detecting the second signal component, perform lock-in detection on the signal received by the receiver using the first reference signal to obtain a first detection signal, perform lock-in detection on the signal received by the receiver using the second reference signal to obtain two second detection signals having different phases from each other, and change at least one of a frequency and a phase of each of the first and second reference signals to set one of the two second detection signals to zero.

    Communication Receiver
    7.
    发明申请

    公开(公告)号:US20180059339A1

    公开(公告)日:2018-03-01

    申请号:US15679078

    申请日:2017-08-16

    IPC分类号: G02B6/42

    摘要: A transimpedance amplifier and photodiode that has a bias voltage node established at a bias voltage and a ground node/plane that connects, over a short distance as compared to the prior art, to a photodiode and a transimpedance amplifier. The photodiode is in a substrate and configured to receive and convert an optical signal to an electrical current. The photodiode has an anode terminal and a cathode terminal which is connected to the bias voltage node. One or more capacitors in or on the substrate and connected between the bias node and the ground node. The transimpedance amplifier has an input connected to the anode terminal of the photodiode and an output that presents a voltage representing the optical signal to an output path. The transimpedance amplifier and the photodiode are both electrically connected in a flip chip configuration and the ground plane creates a coplanar waveguide.