H - Electricity – 02 – J
Patent
H - Electricity
02
J
H02J 1/00 (2006.01) H03K 17/567 (2006.01) H03K 17/687 (2006.01) H03K 17/00 (2006.01)
Patent
CA 2282091
An apparatus for circuit power-down with minimal impact on circuit performance during powered conditions. An embodiment includes a bias block switching means, a first switch, a first switched constant current means and a first voltage follower. The bias block switching means has a first node, second node and a third node. The bias block switching means has a first state for substantially electrically connecting the first node and the third node and a second state for substantially electrically connecting the second node and the third node. The bias block switching means is responsive to a power down control signal for switching between the first state of the bias block switching means the second state of the bias block switching means. The first node of the bias block switching means is operatively coupled to a reference voltage and the second node of the bias block switching means is operatively coupled to a first supply voltage. The first switch has a first node and a second node. The first switch has a first state for substantially electrically isolating the first node and the second node and a second state for substantially electrically connecting the first node and the second node. The first switch is responsive to the power down control signal for switching between the first state of the first switch and the second state of the first switch. The first node of the first switch provides the output signal. The first switched constant current means is coupled to the first node of the first switch and the first supply voltage. The first switched constant current means has a first state for providing a constant current output and a second state for providing substantially no current. The first switched constant current means is responsive to a bias signal for switching between the first state of the first switched constant current means and the second state of the first switched constant current means. The bias signal is output from the third node of the bias block switch. The first voltage follower has a first terminal, a second terminal and a third terminal. The first terminal receives the input signal, the second terminal is operatively coupled to the second voltage supply and the third terminal is operatively coupled to the second node of the first switch. An advantage is only permitting parasitic current during power-down operation. Multiple stages are possible.
Gowling Lafleur Henderson Llp
Nortel Networks Corporation
Nortel Networks Limited
LandOfFree
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