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设计并研制了以声电荷转移(ACT)方基础的带有单片抽头加权控制电路的可程序抽头延迟线(PTDL)。ACT器件是一种新型高频单片电荷转移器件(CTD),在此器件中,载流子由传播于GaAs之类压电半导体中的大功率声表面波(SAW)的行波电场来聚集,并在此电场范围内转移。这种ACT/PTDL器件由ACT延迟线、32抽头电极阵列、和以GaAs肖特基势垒二极管为基础的抽头加权控制电路所构成。此器件是一种单片GaAs横向滤波器,其工作带宽为180MHz,抽头间隔为22.4ns,抽头加权控制为8bit。ACT/PTDL是完全可程序的,抽头加权由借助于数字/模拟(D/A)接口板的微机来控制。 ·
A programmable tapped delay line (PTDL) with a monolithic tap weighting control circuit based on acoustic charge transfer (ACT) was designed and developed. The ACT device is a new type of high frequency monolithic charge transfer device (CTD) in which carriers are collected by a traveling wave electric field of a high-power surface acoustic wave (SAW) propagating in a piezoelectric semiconductor such as GaAs , And within this electric field transfer. The ACT / PTDL device consists of an ACT delay line, a 32-tap electrode array, and a tap weight control circuit based on a GaAs Schottky barrier diode. This device is a monolithic GaAs transversal filter operating at 180MHz bandwidth with tap spacing of 22.4ns and tap weight control of 8bit. The ACT / PTDL is fully programmable and the tap weights are controlled by a microcomputer via digital / analog (D / A) interface board. ·