Part Number: LMH6553
I have question for gain setting with clamp operation.
According to the description of clamp operation in datasheet P.22, Figure 59 shows example circuit whose gain is 2V/V.
However, I could not find the wave which is represented in gain with 2V/V in the Figure.
If the output is not clamped for single-ended input in the circuit offering 2V/V gain, how is output level of VOUT+ and VOUT- respectively?
For example, if Vin = 0.5Vpp is assumed in Figure 59, how are VOUT+ and VOUT-?
In reply to Rohit Bhat:
>I don't really understand what you mean by the wave that represents 2V/V gain,
> because the gain is fixed and not changing like a wave.
Sorry, my explanation was not clear and I was misunderstanding.
I had thought SE unclamped output would be double of SE input because gain is 2V/V under unclamped condition.
The red wave in following figure was my idea. Of course, I didn't think this would be output, due to output swing limit.
Anyway, I now understand that each output Vout+ and Vout- should ideally swing 2Vpp if the input is 2Vpp and 2V/V gain.
Next, let me ask you questions using following circuit. It is 5V single supply and it has gain of 8.29.
At first, I want to confirm if following understanding is correct.
Supposing SE input and output, VOUT+ or VOUT- would have gain of 4.14 from previous consideration.
If 0.3Vpp pulse input is supposed, Vout+ should swing 1.2Vpp from Vcm=2.5V and it would be unclamped.
Is it correct?
Next, I obtained actual data like following.
According to this data, pulse width seems to extend at output if amplitude of input pulse is over 250mV.
Could it be correct behavior of this IC?
I appreciate if you could reply.
In reply to na na78:
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