respective currents of equal magnitude in the embodiment shown i 3 354 powers diode 362 and i 4 356 powers diode 360 resulting in diode junction voltages v be dpi and v be dmi respectively the difference between the magnitude of v be dpi and the magnitude of v be dmi may correspond to u03b4v be which is generated across diode 358 when switching from the sampling phase to the integration phase that is when p 1 is switched from an on position to an off position and correspondingly p 2 is switched from an off position to an on position operation of the circuit shown in fig5 a is similar to that shown in fig4 when applying p 1 290 and p 2 292 again when p 1 290 is closed and p 2 292 is open the circuit is operating in the sampling phase however unlike in the voltage configuration illustrated in fig4 where p 1 290 was used to couple vip 260 to cinp 410 and to couple vim 362 to cinm dp 264 may be directly coupled to cinp 310 and dm 266 may be directly coupled to cinm 312 as a result of this direct coupling charge is being generated at cinp 310 and cinm 310 during both the sampling phase and the integration phase by coupling the anode of diode 362 to dpi 370 and the anode of diode 360 to dmi 372 a voltage of the.