| 摘要 |
<p>A wideband sample-hold circuit (10) is formed with a single diode (D) in a minimum component configuration. A gate circuit comprised of a first capacitor (Cg) and an impedance element (Z) forms a gate pulse, stores the sampled signal charge on the first capacitor (Cg), and transfers the charge to a second capacitor (Ch) via the impedance element (Z). The impedance element (Z) also defines the gate pulse width, in combination with the first capacitor (Cg). In a preferred mode, the first capacitor (Cg) is responsive to individual gate pulses while the larger second capacitor (Ch) integrates charge packets from the first capacitor (Cg) due to multiple gate pulses to provide an integrated baseband output (20). In radar rangefinder applications, the baseband output (20) is an equivalent time replica of the RF input (18). The sample-hold circuit (10) has other applications in radar motion sensing and time domain reflectometry.</p> |
