Abstract: A temperature stable bias circuit for a radio frequency (RF) power amplifier uses current deletion and current supplement techniques to maintain the bias, or reference current of the RF power amplifier at a stable level regardless of the temperature that the power amplifier is operating. When temperature increases, the current deletion circuitry reduces the bias current supplied to the power transistor. When the temperature decreases, the current supplement circuitry increases the bias current supplied to the power transistor. This bias circuitry allows the output of the RF power amplifier to remain constant. The current deletion and current supplement circuitry can be fabricated using the same processing technology as the power amplifier and can be easily integrated into the power amplifier device packaging.

Abstract: A trailer is equipped with a surge braking system having a braking/dampening unit 70 that is integrated with a common reservoir 71 that supplies brake fluid to both the master brake cylinder 72 and the dampener cylinder 75, so that if the master cylinder is starved of brake fluid, the dampener also is starved of fluid and the jarring between the forward hitch and the rear housing in response to acceleration and deceleration of the towing vehicle will alert the operator of the towing vehicle to replenish the reservoir with brake fluid. Safety cable 111 connects at one end to the towing vehicle and actuates the master cylinder in response to tension being applied thereto, and latch 98 moves in behind the master cylinder and locks the master cylinder in it operative position so as to hold the brakes in their locked position.