Patent ID: 11881821
Assignee: SPREADTRUM COMMUNICATIONS (SHENZHEN) CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. The signal generation circuit according to claim 7, wherein
the comparison unit further includes:
the second comparator including a third input terminal configured to receive a carrier signal output by the capacitor, a fourth input terminal configured to receive the second voltage, and a second output terminal configured to output a second comparison signal to the trigger to cause the trigger to output, based on a voltage of the carrier signal smaller than the second voltage, to the second branch circuit the second feedback signal with the second level;
the trigger further includes a second trigger terminal and a second feedback terminal, and is configured to receive the second comparison signal at the second trigger terminal and output to the second branch circuit the second feedback signal at the second feedback terminal;
the second branch circuit includes a second current source and a second branch circuit switch,
wherein, the second current source is connected in series with the second branch circuit switch, and has a current direction being a direction flowing toward the ground; the second branch circuit switch is connected in series with the capacitor, and configured to disconnect with the capacitor based on the second feedback signal with the second level, to cause the capacitor to charge through the first branch circuit.