a strange output of folding blocks

[kickbeer]

folding blocks

hello,

I'm really clueless about my problem. I apply an input signal(1.4Vpp and 10kHz) to the four folding blocks. The reference voltages are shifted about 45° of for each folding block. The 4 output signals only cover the voltage from 1.66669v to 1.7 V. This is far from my expectation that is 1 V to 1.4V. I applied an DC offset from 1 V to the input signal). Can anyon explain me this problem?

 

[tdy]

can u post ur schem?

I like LTspice

 

[kickbeer]

can u post ur schem?

I like LTspice

thx tdy for ready to help me.but the schematic is too large to be taken as a snapshot. Is it ok if i post the circuit including the spice model so that you can simulate it in LTSpice?