摘要:
In one embodiment, a voltage level shifter (810) includes a first p-type metal-oxide-semiconductor transistor (835) having a gate configured to receive an input signal (D) in a first power domain, and a second PMOS transistor (840), wherein the first and second PMOS transistors are coupled in series between a supply voltage (vddout) of a second power domain and a node (820). The voltage level shifter also includes an inverter (850) having an input coupled to the node and an output (Z) coupled to a gate of the second PMOS transistor, and a first n-type metal-oxide-semiconductor transistor (830) having a gate configured to receive the input signal in the first power domain, wherein the first NMOS transistor is coupled between the node and a ground.
摘要:
An apparatus comprising a latch comprising a differential inverter configured to receive a differential input signal and generate a differential output signal, a pair of cross-coupled inverters coupled to the differential inverter, and a first clock switch configured to couple the differential inverter to a voltage source, a second clock switch configured to couple the differential inverter to a ground, wherein the first clock switch and the second clock switch are configured to receive a differential clock signal, and wherein the first clock switch and the second clock switch are both open or both closed depending on the differential clock signal.
摘要:
A quadrature output (IP, IN, QP, QN) high-frequency RF divide-by-two circuit (129) includes a pair of differential complementary logic latches (142, 143). The latches are interconnected to form a toggle flip-flop (200). Each latch (200) includes a tracking cell and a locking cell. In a first embodiment (200), the locking cell includes two complementary logic inverters (201, 205, 203, 207) and two transmission gates (202, 206; 204, 208). When the locking cell is locked, the two gates (211, 213; 212, 214) are enabled such that the locked (i.e., latched) signal passes through both transmission gates and both inverters. In one advantageous aspect, the tracking cell only involves two transmission gates (211, 213; 212, 214). Due to the circuit topology, the first embodiment is operable from a low supply voltage at a high operating frequency while consuming a low amount of supply current. In a second (300) and third embodiment (400), the tracking cell involves a pair of inverters ((301, 304; 302, 305) or (401, 404; 402, 405)). The sources of the transistors of the inverters are, however, coupled together thereby resulting in performance advantages over conventional circuits.
摘要:
A master latch circuit (10) with signal level displacement for a flip-flop (1) clocked by a clock pulse signal (Clk), wherein the master latch circuit (10) comprises a signal delay circuit (13) which delays and inverts the clock pulse signal (ClK), resulting in a specific time delay (AT), and a circuit node (14) which, in a charging phase wherein the clock pulse signal (Clk) is logically low, is charged to an operational voltage (VB) and which, in an evaluation phase when the clock pulse signal (Clk) and delayed, inverted clock pulse signal (ClkDELAY) are logically high, is discharged according to a specific data signal (D), wherein the data signal controls only transistors of a single type (either only N-channel or only P-channel). The master latch circuit (10) has only one supply voltage .
摘要:
A flip-flop (10) includes a charge storage area (22) that stores a logic voltage indicating a logic state of the flip-flop (10), a first transistor (20a) having a source or drain connected to a clock generating circuit (40), a second transistor (20b) having a source or drain connected to the clock signal generating circuit (40), a clock signal generated by the clock signal generating circuit (40) that is ramped or sinusoidal, and a latching circuit (18) that latches a latch voltage value based on voltages at the first transistor (20a) and the second transistor (20b). The charge storage area (22) supplies a first voltage representing a state of the storage voltage to a gate of the first transistor (20a) and supplies a second voltage to a gate of the second transistor (20b).
摘要:
An embodiment latch device includes a first stage (102) having circuitry that receives differential inputs (108) and generates clocked data signals (112) according to a clock signal (106) and the differential inputs (108), and a second stage (104) connected to the first stage (102) and having circuitry that generates differential outputs (122) according to the clock signal (106) and the clocked data signals (112). The second stage (104) further has a reset circuit (114) that resets a latch storage (118) to a high value according to the clock signal (106).
摘要:
Aspects of the disclosure provide a data storage circuit (100, 110). The data storage circuit includes a first latch (120), a second latch (130), and a clock gating and buffer circuit (140). The first latch is configured to provide an intermediate output to the second latch in response to a data input when a clock signal is in a first state and to hold the intermediate output when the clock signal is in a second state, and the second latch is configured to provide a data output in response to the intermediate output and the clock signal. The clock gating and buffer circuit is configured to provide the clock signal, and to suppress providing the clock signal to one or both of the first latch and the second latch when the intermediate output stays unchanged.
摘要:
[A high-speed low-power latch includes three sets of transistors. A first set of transistors selects a tracking mode or a holding mode for the latch based on a clock signal having non-rail-to-rail or rail-to-rail voltage swing. A second set of transistors captures a data value based on an input signal and provides an output signal during the tracking mode. A third set of transistors stores the data value and provides the output signal during the holding mode. The input and output signals have rail-to-rail voltage swing. In another aspect, a signal generator includes at least one latch and a control circuit. The latch(es) receive a clock signal and generate an output signal. The control circuit senses a duty cycle of a feedback signal derived from the output signal and generates a control signal to adjust operation of the latch(es) to obtain 50% duty cycle for the feedback signal.