公开(公告)号：US3713136A

公开(公告)日：1973-01-23

申请号：US3713136D

申请日：1970-09-16

Applicant: WESTON INSTRUMENTS INC

Inventor： NAGY J

IPC: H03M1/00 ,  H03K13/02 ,  H03K13/20

CPC classification number: H03M1/52

Abstract: An analog-to-digital converter of the dual slope integrating type operates without counter reset or input gating circuitry to provide successive, accurate digital readouts representing the average magnitude of corresponding analog input signals. Provision is made to nullify a predetermined number of transient waveforms which may be produced as an undesired by-product of dispensing with such circuitry. The converter employs a buffer storage register to receive and store the digital contents of a counter, which contents represent the average magnitude of the analog input signal. The storage register provides a digital readout, typically in the form of a visual display, which persists at least for a time interval which starts at the termination of one complete analog-to-digital conversion cycle and extends to the termination of a succeeding conversion cycle. In accordance with yet another aspect of this invention to polarity reversals of the analog signal, an offset current of constant magnitude is applied as an additional input signal to the integrator of the converter and appropriate compensation for that value of offset current is provided by the counter so that the display provides an indication only of the value of the analog input signal.

Abstract translation: 双斜率积分型的模数转换器在没有计数器复位或输入门控电路的情况下运行，以提供表示相应模拟输入信号的平均幅度的连续，精确的数字读数。 规定了使预定数量的瞬态波形无效，这些瞬态波形可能是作为分配这种电路的不期望的副产品而产生的。 转换器采用缓冲存储寄存器来接收和存储计数器的数字内容，该内容表示模拟输入信号的平均幅度。 存储寄存器提供数字读出，通常以视觉显示的形式，至少持续一段时间间隔，该时间间隔从一个完整的模数转换周期结束开始，并延伸到终止后续的转换周期 。 根据本发明的另一方面，为了模拟信号的极性反转，将恒定幅度的偏移电流作为附加输入信号施加到转换器的积分器，并且通过计数器提供对该偏移电流值的适当补偿 使得显示器仅提供模拟输入信号的值的指示。