公开(公告)号：US06323801B1

公开(公告)日：2001-11-27

申请号：US09348951

申请日：1999-07-07

申请人： Damien McCartney ,  John O'Dowd ,  Niall McGuinness ,  John Keane

发明人： Damien McCartney ,  John O'Dowd ,  Niall McGuinness ,  John Keane

IPC分类号： H03M112

CPC分类号： H03M3/464

摘要： A method and circuit for providing a reference voltage to a charge balance circuit. The method includes transferring charge corresponding to VBE and charge corresponding to &Dgr;VBE to a summing node of the charge balance circuit, where VBE is a voltage produced across a p-n junction and where &Dgr;VBE is a difference between two VBE voltages. With such method, instead of forming a bandgap reference circuit which produces a bandgap reference voltage and applying such voltage to the reference sampling and charge transfer circuit, charge corresponding to VBE and charge corresponding to &Dgr;VBE are transferred to the input summing node of the modulator in correct proportion and with a polarity corresponding to the modulator output. Thus, the reference sampling and charge transfer circuit delivers VBE and &Dgr;VBE charge samples to the summing node having the correct proportion and polarity, that in aggregate over a modulator cycle, equal the charge that sampling the reference voltage VREF produced by the explicit bandgap reference circuits would deliver.

摘要翻译： 一种用于向电荷平衡电路提供参考电压的方法和电路。 该方法包括将对应于VBE的电荷和对应于DELTAVBE的电荷转移到电荷平衡电路的求和节点，其中VBE是在p-n结上产生的电压，其中DELTAVBE是两个VBE电压之间的差。 利用这种方法，代替形成带隙参考电压，产生带隙基准电压并将该电压施加到参考采样和电荷转移电路，而不是对应于VBE的电荷和对应于DELTAVBE的电荷被传送到调制器的输入求和节点 正确的比例和与调制器输出相对应的极性。 因此，参考采样和电荷转移电路将VBE和DELTAVBE电荷样本传递到具有正确比例和极性的求和节点，在调制器周期中的总和等于由显式带隙参考电路产生的参考电压VREF的采样电荷 会交付