Hi team,
I need to convert a 1Mhz square wave VIN whose VH is 0V and VL is -0.2V to a 1Mhz square wave as VOUT1 or VOUT2 which is shown below. The phrase has to be inverted and the VPP could be VOUT1 or VOUT2.
1. Do you have any solution according to my issue? The circuit should be as simpler as possible and the cost should be as low as possible.
Best Regards
Wesley Huang
VOUT2 can be generated with an inverting amplifier:
For an amplification of -1, set RI = RO.
VOUT1 can be generated with a voltage adder to shift the signal by 200 mV:
Set RI = RO, E1 = input, E2 = 200 mV.
In both circuits, make the resistors high enough so that the input signal is not loaded too much. If the input signal is too weak, you might have to buffer it with another opamp wired as a voltage follower. This will also be necessary for the 200 mV reference if you generate it with a voltage divider.
The opamps' slew rate limits the switching speed, so you should choose one with a high value, such as the TLV9151, LMV116, or LMH6639.
All opamps need a negative power supply.
If the opamp output is too slow, or if deriving the output voltage from the input voltage is too inaccurate, use a comparator-based circuit. Use a fast comparator (e.g., TLV3201, LMV7219, or TLV3501) to compare the input signal against a -100 mV voltage, and use its output to control an analog switch (e.g., TMUX1219) that switches between the two desired output voltages. This circuit also requires a negative power supply.
