A wheel identifying apparatus according to the present invention includes a plurality of transceivers, a triggering device, a receiver, and a wheel identifier. The pump includes a first transistor connected to a first capacitor. This integrating circuit further includes an integrating voltage storage device having a first terminal coupled to the operational amplifier output and a second terminal coupled to the operational amplifier inverting input, and switching circuitry for controlling timing of the integrating circuit and switching the integrating circuit between a reset phase and an integration phase. The first amplifier includes a clamp transistor that has a second oxide thickness that is greater than the first oxide thickness. Other embodiments may be described and claimed.