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LInearity of OTAs without feedback is generally low, mostly due to the nonlinear transconductance curve. I can't imagine that it will give more than 1% (7-Bit) accuracy for a dual slope ADC. In other words, a bad idea.
As in case of a classical operational amplifier you also can use a capacitor in the negative feedback path of an OTA. In addition, you need buffering the output. When the input voltage is applied to the inverting OTA input through a resistor R the voltage transfer function is:H(s)=1/(1+gm*R) - 1/s[(C/gm +RC)]. Gm is the transconductance of the OTA. The second term is equivalent to an inverting integrator. For low frequencies the first term can be neglected in case the product gm*R is small enough.
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