摘要:
A circuit (40) constructed in accordance with this invention includes a ring oscillator (25) to provide a signal which is dependent on the propagation delays of the inverters (33, 34, 35) comprising the ring oscillator, therefore the frequency of the ring oscillator is inversely dependent upon the propagation delays of the inverter comprising the ring oscillator. Means (37) are provided to determine the propagation delay introduced by the components in the ring oscillator by measuring the frequency of the output signal produced by the ring oscillator which provides a signal to a multiplexer (36) which selects among a number of present delay components (26) those components which are necessary to ensure that the propagation delay caused by the circuitry (not shown) connected to the input lead (21) of the circuit constructed in accordance with this invention plus the propagation delay introduced by the selectable delay elements is nearly a constant propagation delay.
摘要:
A circuit (40) constructed in accordance with this invention includes a ring oscillator (25) to provide a signal which is dependent on the propagation delays of the inverters (33, 34, 35) comprising the ring oscillator, therefore the frequency of the ring oscillator is inversely dependent upon the propagation delays of the inverter comprising the ring oscillator. Means (37) are provided to determine the propagation delay introduced by the components in the ring oscillator by measuring the frequency of the output signal produced by the ring oscillator which provides a signal to a multiplexer (36) which selects among a number of present delay components (26) those components which are necessary to ensure that the propagation delay caused by the circuitry (not shown) connected to the input lead (21) of the circuit constructed in accordance with this invention plus the propagation delay introduced by the selectable delay elements is nearly a constant propagation delay.
摘要:
An integrated circuit logic array is fabricated using a BiCMOS process so that it includes an optimum number of bipolar drivers. This is accomplished by means of a chip architecture having three regions: the array core is all CMOS logic gates; surrounding the core is a BiCMOS region; at the periphery of the array are simple bipolar and CMOS devices for I/O purposes. The chip can be fabricated to use these regions to create circuit paths of varying complexity, depending on the application. In a second embodiment, the array consists of cells each containing one bipolar device and several contiguous CMOS gates.
摘要:
An integrated circuit logic array is fabricated using a BiCMOS process so that it includes an optimum number of bipolar drivers. This is accomplished by means of a chip architecture having three regions: the array core is all CMOS logic gates; surrounding the core is a BiCMOS region; at the periphery of the array are simple bipolar and CMOS devices for I/O purposes. The chip can be fabricated to use these regions to create circuit paths of varying complexity, depending on the application. In a second embodiment, the array consists of cells each containing one bipolar device and several contiguous CMOS gates.