Abstract:
The invention relates to an amplifying circuit and to a method for correcting the pulse duty factor of a differential clock signal (CLt, CLc) to give a desired value of 50 % using a differential amplifier (1) having an MOS transistor pair (T1, T2). According to said method, the clock signal (CLt, CLc) to be corrected is applied to the respective gate of the MOS transistor pair (T1, T2), and a differential analog pulse duty correction signal (DCt, DCc) is produced by respective integration of the true and complementary clock signal (ACLt, ACLc) emitted by every MOS transistor (T1, T2) of the differential amplifier (1) on its source/drain connection. The differential pulse duty correction signal (DCt, DCc) thereby obtained is applied to the respective electrically insulated substrate connections (S1, S2) of the MOS transistor pair (T1, T2) so that the substrate voltages and the cutoff voltages of the MOS transistors (T1, T2) of the transistor pair are influenced in the opposite direction.
Abstract:
Die Erfindung betrifft ein Taktsignal-Korrektur-Verfahren, sowie eine Taktsignal-Ein-/Ausgabevorrichtung (1, 101), in die ein Taktsignal (CLK) oder ein hieraus gewonnenes Signal eingegeben, und an eine Frequenzteiler-Einrichtung (4, 104) weitergeleitet wird, wobei ein von der Frequenzteiler-Einrichtung (4, 104) ausgegebenes, oder ein hieraus gewonnenes Signal (clk2) an eine Signal-Integrier-Einrichtung (6, 106) weitergeleitet wird, und wobei ein von der Signal Integrier-Einrichtung (6, 106) ausgegebenes, oder ein hieraus gewonnenes Signal (12) an eine erste Signal-Vergleichs-Schaltung (8, 108b) weitergeleitet wird, wobei das von der Frequenzteiler-Einrichtung (4, 104) ausgegebene, oder das hieraus gewonnene Signal (clk2) zusätzlich an eine zweite Signal-Vergleichs-Schaltung (9, 109a) weitergeleitet wird, und wobei die Taktsignal-Ein-/Ausgabevorrichtung (1) zusätzlich eine Signal-Ausgabe-Schaltung (11, 111) aufweist zum Ausgeben eines Takt-Ausgabe-Signals (clk50) in Abhängigkeit von einem von der ersten Signal-Vergleichs-Schaltung (8, 108) ausgegebenen, oder hieraus gewonnenen Signal (rIclk), und von einem von der zweiten Signal-Vergleichs-Schaltung (9, 109a) ausgegebenen, oder hieraus gewonnenen Signal (rclk).
Abstract:
Circuit for generating an inverse signal of a digital signal with minimal delay difference between the inverse signal and the digital signal. Two inverter circuits (6, 8; 7, 9) have been connected in series. The output signal of the second inverter circuit (7, 9) is the digital signal. An input signal for the first inverter circuit (6, 8) is supplied to a pass-through circuit (13, 14) with threshold action. The signal present between the first (6, 8) and the second (7, 9) inverter circuit is supplied to a control input (16) of the pass-through circuit with threshold action. The signal which is also present between the first (6, 8) and the second (7, 9) inverters appears with some delay at the output (17) of the pass-through circuit with threshold action, which signal is the inverse of the digital signal and at the same time constitutes the output signal of the pass through circuit (13, 14) with threshold action.
Abstract:
A frequency doubler is described which is capable of receiving four input signals in quadrature and combining them to produce a pair of antiphase output signals at twice the input frequency.
Abstract:
Integrated circuit chips with two or more multielement logic paths (A, B) can be made to exhibit virtually skew-free operation by setting the sum of the pull-up delays in one path equal to the sum of the pull-up delays in the other and by setting the sum of the pull-down delays in one path equal to the sum in the other. As a result, analog clock systems become feasible, process dependent race conditions are avoided, countdown circuits have reduced sensitivity to parameter fluctuation, and skewless inversions of clock signals are feasible.
Abstract:
Circuits and a method for correcting duty cycle distortions in an integrated circuit (IC) are disclosed. The IC includes a splitter circuit that is coupled to receive a clock signal. The clock signal is split into two different clock signals. One of the clock signals is an inverted version of the other. A delay circuit is coupled to each of the clock signals. Each of the delay circuits generates a delayed version of the corresponding clock signal. A corrector circuit is coupled to receive both the delayed versions of the clock signals. The corrector circuit generates a clock output signal with a corrected duty cycle.
Abstract:
A mono-cycle generating circuit comprises a control circuit, a multiplexer, and a driver switch circuit. The control circuit generates sets of timing pulses, The multiplexer selects one of the sets of timing pulses. The driver switch circuit outputs a mono-cycle based upon the selected set of timing pulses. The driver switch circuit comprises complementary sets of switches, each complementary set of switches including complementary amplitude pull-up/pulldown functions such that the output mono-cycle is a full rail swing mono-cycle.
Abstract:
A mono-cycle generating circuit comprises a control circuit, a multiplexer, and a driver switch circuit. The control circuit generates sets of timing pulses, The multiplexer selects one of the sets of timing pulses. The driver switch circuit outputs a mono-cycle based upon the selected set of timing pulses. The driver switch circuit comprises complementary sets of switches, each complementary set of switches including complementary amplitude pull-up/pulldown functions such that the output mono-cycle is a full rail swing mono-cycle.
Abstract:
Techniques for providing improved memory flip-flops and other logic circuits are described. A flip-flop uses only one p-channel transistor (M14) to drive the output node strongly to achieve fast results. To reduce diffusion area, parallel logic is substantially eliminated and only series branches are used, in critical areas. This allows all pull-up transistors and/or all pull-down transistors to be formed from contiguous active areas. The D-to-Q path is reduced, and the clock is used to control the output. The clock becomes the dominant controller of the output when it is located closest to the output. Placing the clock devices (M35, M39-M40) closest to the clocked nodes reduces clock skew. The rising D response time and falling D response time are caused to be as close as possible to reduce the overall cycle time. To reduce parasitics in the circuit, complex-gates are used which are asymmetric. Even multiples of series branches per gate are used to share contacts and eliminate breaks in the layout diffusion. Adding complex-gates to a circuit while using asymmetric gates for smaller layouts achieves additional functionality. One component of the clock, along with the master drive circuit, is used to drive the slave latch of a flip-flop to avoid inserting additional gates into the logic of the fast output path. Reset and set circuitry is designed to be outside the critical path of the clock, and outside the slave latch, to provide rapid Q output response time to the clock and D inputs.
Abstract:
A BICMOS inverter circuit having a high input impedance, improved switching characteristics, low power requirements, high noise immunity, high drive capability, an increased output voltage swing, reduced body effect, high current drivability and improved power dissipation comprises a CMOS inverter for receiving an input signal and bipolar push-pull output transistors (58, 59) for supplying an output. An intermediate CMOS stage (41, 42) is coupled between the CMOS inverter and the bipolar push-pull output transistors and to power supply voltages in a manner that eliminates body effect.