- Patent Title: Charge pump phase locked loop with low controlled oscillator gain
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Application No.: US17381754Application Date: 2021-07-21
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Publication No.: US11374580B2Publication Date: 2022-06-28
- Inventor: Sagnik Mukherjee , Ankit Gupta
- Applicant: STMicroelectronics International N.V.
- Applicant Address: CH Geneva
- Assignee: STMicroelectronics International N.V.
- Current Assignee: STMicroelectronics International N.V.
- Current Assignee Address: CH Geneva
- Agency: Crowe & Dunlevy
- Main IPC: H03L7/093
- IPC: H03L7/093 ; H03L7/099

Abstract:
A PLL includes a phase-frequency-detector-and-charge-pump-circuit (PFDCPC) receiving a reference signal and divided signal, and generating a charge-pump current. A loop-filter is between output of the PFDCPC and a reference-voltage. A first voltage-to-current converter (V2I1) has low gain, and a second voltage-to-current converter (V2I2) has high gain. A low-gain-path is between outputs of the PFDCPC and V2I1, and a high-gain-path is between the outputs of the PFDCPC and V2I2. A current-controlled-oscillator receives an input signal, and generates an output signal. A loop divider divides the output signal by a divider-value, producing the divided signal. The low-gain-path runs directly from the PFDCPC, through the V2I1, to the input of the current-controlled-oscillator. The high-gain-path runs from the PFDCPC to the loop-filter, from a tap of the loop-filter to a low-pass filter through a current mirror, from a tap of the low-pass filter through the V2I2, to the input of the current-controlled-oscillator.
Public/Granted literature
- US20220038105A1 CHARGE PUMP PHASE LOCKED LOOP WITH LOW CONTROLLED OSCILLATOR GAIN Public/Granted day:2022-02-03
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