Circuits & Schematics: CHESS CLOCK

1. Non-linear pullup for multi-rate I²C buses
   Circuits Interfaces Microcontrollers Usage Texas Instruments SN74LVC2G66 SN74LVC74APWR TLV3202
   .. 2 C is a popular bidirectional serial communications bus having a clock and a data line. Both line’s drivers consist of an open drain ground-referenced N-channel MOSFET with a ...
   13-05-2024

2. Efficient digitally regulated bipolar voltage rail booster
   Circuits Analogue Design Supply onsemi MC74AC132
   .. and regulation of bipolar beyond-the-rails voltages. Schmidt trigger oscillator U1a provides a continuous ~100 kHz clock signal to charge pump drivers U1b (positive rail pump) and U1c (negative rail). When enabled, these drivers can ...
   26-04-2024

3. Rotary encoder mates with digital potentiometer
   Circuits Digital Switch Channel RE11
   .. The AD5220 from Analog Devices is a 128- step, pushbutton digital potentiometer. It operates with a negative-edge-triggered clock, ∖CLK, and an increment/decrement direction signal, U/∖D. When B leads A (clockwise), the quadrature decoder ...
   29-03-2024
4. Efficient voltage doubler is made from generic CMOS inverters
   Circuits Supply Texas Instruments SN74AC14
   .. cap C C to U2 with U2’s input clamps providing DC restoration. Figure 3. Complete voltage doubler: 100 kHz pump clock set by R1C1, Schmidt trigger, driver (U1), and commutator (U2). Consider the ONE half cycle of the square-wave. ...
   14-03-2024
5. Voltage inverter uses gate's output pins as inputs and its ground pin as output
   Circuits Supply Texas Instruments SN74AC14 CD40106B
   .. is shown in Figure 3. It’s really not as complicated as it looks. Figure 3. Complete voltage inverter: 100 kHz pump clock (set by R1C1), Schmidt trigger and driver (U1), and commutator (U2). A 100 kHz pump clock is output on pin 2 of ...
   13-03-2024
6. Control a processor's power supply in real time
   Circuits Supply Microcontrollers Usage Analog Devices AD5258 ADP3051
   .. which power management is key, a microprocessor may adjust its core voltage corresponding to an increase or a decrease in clock speed, allowing full processing power when necessary but not wasting excess power when idle. The circuit of ...
   25-01-2024
7. 0.05 µV/°C chopped amplifier requires only 5 µA supply current
   Circuits Amplifiers Analog Devices LT1495 LTC1440
   .. C chopped amplifier requires only 5 µA supply current. The micropower comparators (C1A and C1B) form a biphase 5 Hz clock. The clock drives the input-related switches, causing an amplitude-modulated version of the DC input to appear ...
   15-12-2023
8. DC-voltage doubler reaches 96% power efficiency
   Circuits Supply Analog Devices AD8617 ADG888
   .. in which power efficiency is a critical issue. The two phases of operation repeat periodically at frequency f, which clock generator IC 2 determines. The duty cycle is about 50%, but the value isn’t all that critical. One half ...
   19-10-2023
9. A 50 MHz 50:50-square wave output frequency doubler/quadrupler
   Circuits Signal Processing, Filters Texas Instruments SN74AC86 SN74AC74 TLV2374
   .. two loops are essentially identical, let’s talk about the OG loop. Each timing sequence begins when U1pin8 delivers a clock pulse to U3 pin . U3 is positive-edge-triggered and responds by driving U3 pin 6 low. This disconnects D2 from ...
   10-10-2023
10. Circuit's RMS output is linearly proportional to temperature over wide range
    Circuits Measurement Analog Devices LT1001
    .. source. In Figure 2 the load resistor of Q2 is switched into or out of the collector by an extra transistor, Q3 driven by a clock source V 3 having 50% duty cycle. Thus the load resistance variably has the value R1 when V 3 = 5 V and (R1 + ...
    03-10-2023

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