Invention Grant
- Patent Title: Phase shift circuit with lower intrinsic delay
- Patent Title (中): 具有较低固有延迟的相移电路
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Application No.: US11880577Application Date: 2007-07-23
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Publication No.: US07642831B2Publication Date: 2010-01-05
- Inventor: Andy Nguyen
- Applicant: Andy Nguyen
- Applicant Address: US CA San Jose
- Assignee: Altera Corporation
- Current Assignee: Altera Corporation
- Current Assignee Address: US CA San Jose
- Agency: Mauriel Kapouytian & Treffert LLP
- Agent Ararat Kapouytian
- Main IPC: H03K3/00
- IPC: H03K3/00

Abstract:
A phase shift circuit that includes two, rather than four, delay chains and corresponding selectors is described. This provides a significant area savings and reduces the intrinsic delay of the phase shift circuit, which is particularly beneficial for embodiments in which there is no intrinsic delay matching. In one implementation, the phase shift circuit includes a first delay circuit and a matching delay circuit. The first delay circuit provides a first delay that includes a first intrinsic delay and a first intentional delay. The delay matching circuit provides a matching delay that matches the first intrinsic delay. In one implementation, the phase shift circuit also includes a second delay circuit to provide a second delay that includes a second intrinsic delay and second intentional delay, where the second intrinsic delay matches the first intrinsic delay and the second intentional delay is half as long as the first intentional delay.
Public/Granted literature
- US20090027098A1 Phase shift circuit with lower intrinsic delay Public/Granted day:2009-01-29
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