Teledyne Le Croy Teledyne Le Croy Hypersampled ADCs

Teledyne Le. Croy�介

Teledyne Le. Croy公司概况

干�清�的信号不等于�波�理的信号 Hypersampled ADCs and Linear Noise Reduction

�源分布网� PDN（Power Distribution Network)的概念 典型的PDN包括： • Voltage Regulator Modulation （VRM） • Board-level power distribution with planes, low-frequency decoupling capacitors • Package level power distribution with planes and mid-frequency decoupling capacitors • Chip-level power distribution with thin-oxide decoupling capacitors PDN 要求: • Must deliver clean power to the ICs • Must provide low impedance, low noise reference path for signals • Must not contribute excessive EMI

Eric Bogatin��量�源噪声所需��的理解 The noise on the board level PDN can have frequency components as high as the bandwidth of the signals. This is from signals passing through the power and ground planes of the board. So, the noise bandwidth can be very highmaybe 5 GHz for a 1 GHz clock. The noise on the power rail on the chip, as seen on the board, is much lower- probably less than 500 MHz. It is filtered by the package lead inductance and doesn’t get on the board very much. The HDO scope with a 1 GHz bandwidth is plenty adequate to see this noise. The HDO scope is excellent at PDN noise measurement and analysis. It probably will not see any noise that might be present on the board at > 1 GHz bandwidth. If the signal paths are designed well, the noise in the power and ground plane cavities should be low at these higher bandwidths.

Eric Bogatin��量�源噪声所需��的理解 For PDN noise, the 2. 5 GS/s is probably just fine. For the plane noise, higher BW is needed to see the noise generated as signals pass through vias through the planes. It is very difficult to evaluate the filtering from the package lead inductance. You need to know the package lead inductance and the on-die capacitance. If you have a simple guess for these values you can simulate the filtering using SPICE. Doing the actual on-die measurements of the noise requires a specially designed chip.

5 mv/div VS 500 mv/div

HD 4096 –更加“干� ”，“清晰”的�示 12 -bit HDO 8 -bit Oscilloscope

HD 4096 –更加“干� ”，“清晰”的�示 12 -bit HDO 8 -bit Oscilloscope

HD 4096 –更加“干� ”，“清晰”的�示 12 -Bit HDO 8 -Bit Oscilloscope

串行数据解�与触� UART/RS 232/RS 429 SPI/I 2 C/I 2 S CAN Flex. Ray LIN MIL-STD-1553 ARINC 429 Dig. RF D-PHY USB PCI Express Fibre Channel 8 B/10 B, 64 B/66 B, 曼彻斯特编码 10 M/10 G以太网