Track-and-hold


Posted on Jan 26, 2013

The 5-MHz track and hold shown here has a 400-kHz power bandwidth driving ±10 V. A buffered input follower drives the hold capacitor, C4, through Ql, a low resistance FET switch. The positive hold conuuand is supplied by TTL logic, with Q3Ievel shifting to the switch driver, Q2. The output is buffered by A3. When the gate is driven to V-for hold, it pulls the charge out of the hold capacitor. A compensating charge is put into the hold capacitor through C3. The step into hold is made independent of the input level with R7, and adjusted to zero with RIO.


Track-and-hold
Click here to download the full size of the above Circuit.

Since internal dissipation can be quite high when driving fast signals into a capacitive load, using a buffer in a power package is reconuuended. Raising the buffer quiescent current to 40 mA with R3 improves frequency response.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Voltmeter circuit
    Successive approximation a-d converter
    Booster Amplifier For Car Stereo Use Circuit
    simple gauss detection switch
    Flyback Transformer Drivers
    Precision QRP Transmitter
    ICL8038-based Oscillator
    A read-only phase sequence indicator circuit
    Bridge the digital pressure signal conditioner MAX1458 excitation circuit diagram



    Top