ECL circuit
First Claim
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1. An ECL circuit comprising:
- an ECL circuit portion having an ECL structure without emitter follower output transistors for deriving first and second differential signals; and
a level shift circuit portion for level-shifting said first and second signals to output the level-shifted first and second signals wherein said level-shift circuit portion includes;
a first resistor having a first and directly receiving, without buffering, said first signal;
a second resistor having a first end directly receiving, without buffering, said second signal;
a first constant-current source connected to a second end of said first resistor; and
a second constant-current source connected to a second end of said second resistor.
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Abstract
A flip-flop circuit of ECL structure includes an ECL circuit portion and a level shift circuit portion including a circuit having a pair of resistors. The ECL circuit portion applies a differential signal to one end of each of the resistors, and Q and/Q output signals are derived from the other ends of each of the resistors. The amount of level shift down of the signals when shifted by the resistors is enabled to be set to any relatively small amount, whereby the ECL circuit is permitted to operate at a low voltage.
20 Citations
7 Claims
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1. An ECL circuit comprising:
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an ECL circuit portion having an ECL structure without emitter follower output transistors for deriving first and second differential signals; and a level shift circuit portion for level-shifting said first and second signals to output the level-shifted first and second signals wherein said level-shift circuit portion includes; a first resistor having a first and directly receiving, without buffering, said first signal; a second resistor having a first end directly receiving, without buffering, said second signal; a first constant-current source connected to a second end of said first resistor; and a second constant-current source connected to a second end of said second resistor. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An ECL circuit, comprising:
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an ECL circuit portion having an ECL structure without emitter follower output transistors for deriving first and second differential signals; and a level shift circuit portion for level-shifting said first and second signals to output the level-shifted first and second signals wherein said level shift circuit portion includes; a first resistor having a first end directly receiving, without any intervening elements, said first signal; a second resistor having a first end directly receiving, without any intervening elements, said second signal; a first constant-current source connected to a second end of said first resistor; and a second constant-current source connected to a second end of said second resistor.
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Specification