| 摘要 |
<p>In a signal processing circuit of an LNB (Low Noise Block down converter) (1), a power supply circuit (12) is driven by DC voltage (V1a-V1d) applied from four tuners (34) via four signal input/output terminals (4a-4d) to generate supply voltage (V2a-V2d, V3) for the LNB (1) and equally distribute consumption current of the LNB (1) among the four signal input/output terminals (4a-4d). Even if the level of the DC voltage (V1a-V1d) from the four tuners (34) is changed, currents of the same value flow through the four signal input/output terminals (4a-4d). Therefore, there is less noise compared with the conventional circuit having a signal input/output terminal allowing current to flow that varies. <IMAGE></p> |
