Figure 5-35. VD Card - Block Diagram

T.O. 31W2-2GSC24-2

TM 11-5805-688-14-1

NAVELEX 0967-LP-545-3011

This boost enable signal is generated to increase the

applied drive voltage and produces the reconstructed

drive voltage to the integrator circuit and achieve the

analog signal that is applied to a bandpass filter circuit.

response necessary to faithfully reproduce the analog

signal from the decoded digital pulses.

5-450. When the decoder logic generates the boost

enable signal, the active negative or positive drive signal

5-449. The slope control circuit generates the drive

applied to the integrator increases in amplitude to

voltage that determines the slope of the integrator output

produce a sharper slope for the drive signal applied to

signal. The negative drive voltage from the slope control

the integrator. The integrator output, in turn, has a

is applied to an inverter and to the negative inhibit switch.

sharper rising or falling slope that enables the

The inverted output from the inverter is applied as a

reconstructed analog signal voltage to increase at a

positive drive voltage to the positive inhibit switch. The

greater rate. Once the boost requirement is satisfied,

polarity of the bit 1 (one or zero) signal applied to the two

the boost enable output from the logic decoder output

switches determines which switch is enabled to apply

returns to its normal decreased drive state until the next

either the negative drive or the positive drive signal to the

series of three ones or zeros is applied 'from the 3-bit

integrator. The integrator, in turn, responds to the

shift register.

5-119