Test structure and probe for differential signals
First Claim
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1. A test structure comprising a cell including a first in put signal probe pad capacitively interconnected to a first output signal probe pad and a second input signal probe pad capacitively interconnected to a second output signal probe pad, said test structure comprising:
- (a) a first capacitor interconnecting said first input signal probe pad and said second output signal probe pad; and
(b) a second capacitor interconnecting said second input signal probe pad and said first output signal probe pad;
whereinsaid first capacitor has a capacitance substantially equal to a capacitance of said interconnection of said first input signal probe pad and said first output signal probe pad and said second capacitor has a capacitance substantially equal to a capacitance of said interconnection of said second input signal probe pad and said second output signal probe pad.
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Abstract
A test structure including a differential gain cell and a differential signal probe include compensation for the Miller effect reducing the frequency dependent variability of the input impedance of the test structure.
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Citations
8 Claims
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1. A test structure comprising a cell including a first in put signal probe pad capacitively interconnected to a first output signal probe pad and a second input signal probe pad capacitively interconnected to a second output signal probe pad, said test structure comprising:
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(a) a first capacitor interconnecting said first input signal probe pad and said second output signal probe pad; and (b) a second capacitor interconnecting said second input signal probe pad and said first output signal probe pad;
whereinsaid first capacitor has a capacitance substantially equal to a capacitance of said interconnection of said first input signal probe pad and said first output signal probe pad and said second capacitor has a capacitance substantially equal to a capacitance of said interconnection of said second input signal probe pad and said second output signal probe pad.
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2. A probe for probing a cell comprising a first input signal probe pad capacitively interconnected to a first output signal probe pad and a second input signal probe pad capacitively interconnect to a second output signal probe pad, said probe comprising:
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(a) a first probe tip connectible to a source of a first input signal and arranged for contact with said first input signal probe pad of said cell; (b) a second probe tip connectible to a source of a second input signal and arranged for contact with said second input signal probe pad; (c) a third probe tip connectible to a sink of a first output signal and arranged for contact with said first output signal probe pad; (d) a fourth probe tip connectible to a sink of a second output signal and arranged to contact said second output signal probe pad; (e) a first capacitor interconnecting said first probe tip and said fourth probe tip; and (f) a second capacitor interconnecting said second probe tip and said third probe tip. - View Dependent Claims (3, 4, 5)
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6. A test structure for testing a functionality of a transistor, said test structure comprising:
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(a) a first transistor including; (i) a first terminal connectible through a first resistance to a source of a first component of a signal; (ii) a second terminal connectible through a second resistance to a sink for a first component of an output signal and interconnected to said first terminal by a parasitic capacitance; and (iii) a third terminal; (b) a second transistor including; (i) a first terminal connectible through a third resistance to a source of a second component of a signal; (ii) a second terminal connectible through a fourth resistance to a sink for a second component of an output signal and interconnected to said first terminal by a parasitic capacitance; and (iii) a third terminal interconnected with said third terminal of said first transistor and a source of a bias voltage; (c) a first compensating capacitor connecting said first terminal of said first transistor to said second terminal of said second transistor; and (d) a second compensating capacitor connecting said first terminal of said second transistor to said second terminal of said first transistor. - View Dependent Claims (7, 8)
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Specification